feeling pain in the right side of the arm; feeling pain in the right side of the arm and neck that goes from shoulder to the top of her ear; Extreme headache/Blood rushing straight to the top of her head like it was going to explode; crying; could not move her right arm and shoulder/hard time turning her neck; felt like her right shoulder was dislocated; All of a sudden she stated experiencing this feeling and pain, unknown if it is a pinched nerve or muscle; All of a sudden she stated experiencing this feeling and pain, unknown if it is a pinched nerve or muscle; I've ever experienced!! I thought I was about to die or have a brain aneurysm; The initial safety information received was reporting only non-serious adverse drug reactions, Upon receipt of follow-up information on [31Aug2021], this case now contains serious adverse reactions. Information processed together.  This is a spontaneous report from a contactable consumer (patient). A 39-years-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), via an unspecified route of administration, administered in Arm Left on 08Mar2021 16:00 at 39-years-old (Batch/Lot Number: EL9264) as dose 1, single for COVID-19 immunization.  Medical history included Sensory Neuropathy from Dec2019 and ongoing (Diagnosed while hospitalized for this in Dec2019), ongoing Anxiety, Asthma from 1995 and ongoing (around age of 13 years). Vaccination Facility Type: health clinic. Concomitant medications included lorazepam taken for Anxiety from Jun2015 and ongoing (Most recently restarted around time of COVID-19 pandemic which really exacerbated anxiety so doctor put her back on Lorazepam as needed); gabapentin  taken for Sensory neuropathy from 22Dec2020 and ongoing; cyanocobalamin (VITAMIN B12) taken for Deficiency from Dec2019 and ongoing; vitamin d taken for Deficiency from Dec2019 and ongoing.  Caller mentions that she got the first dose of the Pfizer covid 19 vaccine this past Monday March 8th on her left arm and then on Thursday she started feeling pain in the right side of the arm and neck that goes from shoulder to the top of her ear. Also she experienced extreme headache like exploding in the top of her skull like an orgasm and also was the same intensity on Friday. She was not sure if the headache was caused by the vaccine or was spontaneous. She wanted to know whether she continued to get the second dose of the vaccine. Caller mentions that she is concerned about the low representability of her race in the clinical trial and that her side effects would be disregarded because of that. She thinks that the amount of people like her, of the trial is not representative of the whole population living in the country and the side effects that are taking in the trial are not disclosed for the races that were participating on it. She reported experiencing side effects that that she is not sure are connected to the vaccine, but that she believes are connected to the vaccine. She reported it is like you know how sometimes you don't know if it is 100% related to something or not, but she has never really experienced these side effects like this before the Pfizer-BioNTech COVID-19 Vaccine. Side effects reported include, pain which started evening of 11Mar2021. She woke in the middle of the night, probably into Friday, 12Mar2021 at that point, and had really, extremely bad pain in her right arm and was crying; she could not move her right arm and shoulder; felt like her right shoulder was dislocated. She has never had a dislocated shoulder but she felt like maybe it would feel like that event because she could not move her right arm and shoulder. She went back to sleep that night. By the time she woke up later on 12Mar2021 the pain was gone and she was able to rotate her shoulder and arm, able to perform regular movement, range of motion; events kind of went away for a while. When she woke up Saturday morning, 13Mar2021, all of a sudden she started experiencing this feeling and pain, unknown if it is a pinched nerve or muscle, but that feeling from like her lower right shoulder all the way up to behind the top of her right ear and has a hard time turning her neck. She is taking Tylenol and Ibuprofen for pain and inflammation. She reported another side effect that is pretty personal, and she does not know if it is connected to the vaccine, but she feels like it is connected to the vaccine because she has never experienced this until after she was administered the Pfizer-BioNTech COVID-19 Vaccine: On Thursday, 11Mar2021 she had the most extreme headache from orgasming. She did not know if it was an isolated event so she said let her try it again the next day and it happened again on Friday, 12Mar2021, it was so painful, she was like oh my God, she could feel the blood rushing straight to the top of her head like it was going to explode. The event on Thursday, 11Mar2021 was worse than the event on Friday, 12Mar2021 12Mar2021 event was almost as bad as on Thursday, 11Mar2021 but she stopped midway because she thought if she finished her head might explode. The extreme headache from orgasming had an interesting lingering effect, it did not go away right away; the initial rush of pain that went to the very top of her head took a while to subside on Thursday, 11Mar2021, did not go away probably until unknown time-she took some pain killers because the pain was just that bad and she fell asleep. When she woke up on Friday, 12Mar2021 the pain was there so she took 1 Tylenol that evening. Side effects outcome, She thought this would go away, but it has not gone away she cannot say side effects have worsened but they have not improved, remained pretty much persistent. Pain level on scale of 1-10 she reported as 8 at this time. She did plan to get the second dose as scheduled for 29Mar2021 but she does have second thoughts based on the side effects she is experiencing but will that prevent her from getting the second dose more than likely not. She just has her concerns about these side effects which hopefully are not permanent. It was further reported that the patient received the 1st dose in her left shoulder on 08Mar2021, on 10Mar2021 she woke up in the middle of the night crying because her right shoulder felt like it was dislocated. She could not move her right arm. When she woke up about 9 am. She had a sharp painful pinched nerve, running from the top of the back of my right ear, all the way down to her shoulder wing blade. Then when orgasming. She felt all the blood in her body rushing to the top of her head/skull. The most painful headache she had ever experienced!! She thought she was about to die or have a brain aneurysm! 2nd attempt on 11Mar2021- happened again! She called them, then her doctor. The patient experienced feeling pain in the right side of the arm on 11Mar2021 with outcome of not recovered, feeling pain in the right side of the arm and neck that goes from shoulder to the top of her ear on 10Mar2021 with outcome of not recovered, extreme headache/blood rushing straight to the top of her head like it was going to explode on 10Mar2021 with outcome of not recovered, crying on 10Mar2021 with outcome of not recovered, could not move her right arm and shoulder/hard time turning her neck on 10Mar2021 with outcome of not recovered, felt like her right shoulder was dislocated on 10Mar2021 with outcome of not recovered, all of a sudden she stated experiencing this feeling and pain, unknown if it is a pinched nerve or muscle, but that feeling from like her lower right shoulder all the way up to behind the top of her right ear and has a hard time turning her neck on 10Mar2021 with outcome of not recovered, brain aneurysm on 10Mar2021 with outcome of unknown.  Therapeutic measures were taken as a result of events except brain aneurysm.  The patient was advised not to take second dose.  Seriousness criteria was reported as serous, Important medical event.   No follow-up attempts are needed. No further information is expected.