Severe Back pain; Fever; Severe Headaches; Anxiety was worse; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient. A 37 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 28Dec2021 (Lot number: 330258D, Expiration Date: Feb2022) at the age of 37 years as dose 2, single for covid-19 immunisation; influenza vaccine (FLU), administered in arm right, administration date 28Dec2021 (Batch/Lot number: unknown) as dose number unknown, single. Relevant medical history included: "obese", start date: 2020 (unspecified if ongoing), notes: starting 2 years ago; "Hashimoto's disease", start date: 2018 (unspecified if ongoing), notes: Diagnosed 4 years.; "Anxiety" (unspecified if ongoing); "underlying back problems" (unspecified if ongoing); "detoxing off of alcohol" (unspecified if ongoing); "rehab", start date: 19Dec2021, stop date: 24Dec2021, notes: alcohol detox center. Family history included: "high blood pressure" (unspecified if ongoing), notes: before the vaccine., Family Medical History Relevant to AE(s): High blood pressure. The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (DOSE 1, 1st dose Lot FH8027, Expiration is Feb2022, Injected in right arm.), administration date: 04Dec2021, when the patient was 37 years old, for COVID-19 immunization, reaction(s): "no side effect". The following information was reported: HEADACHE (non-serious) with onset 29Dec2021, outcome "recovering", described as "Severe Headaches"; BACK PAIN (non-serious), outcome "not recovered", described as "Severe Back pain"; PYREXIA (non-serious) with onset 29Dec2021, outcome "recovering", described as "Fever"; ANXIETY (non-serious) with onset Dec2021, outcome "not recovered", described as "Anxiety was worse". Therapeutic measures were taken as a result of anxiety.  Additional information: She received first dose 04Dec2021 and had no side effects. She received her 2nd vaccine on 28Dec2021. The next morning, she had severe headaches and had been lingering around since, but gotten better now. She also had back pain, which was very severe. She had a doctor's appointment on Tuesday. She had underlying back problems and it got worse since she got the vaccine. It was years ago and she was a professional dancer. Her back problems got better and after the vaccine got a lot worse. The back pain happened a few days after 2nd dose, and had gotten progressively worse. She called a nurse help line and was said to call Pfizer to report. Her mom was bugging her to get it. Everyone was getting COVID and she wanted to protect herself. She did mention to the nurse that she was taking more anxiety medication than usual. She doesn't think it has to do with the vaccine. Her anxiety is worse than usual and she is needing to take more. She noticed it was worse around 22Dec2021 or 23Dec2021, when she began Buspar. She was also detoxing off of alcohol. She was not necessarily detoxing, but she was there for cravings and the hospital gave her Buspar and started giving it to her there. She said she went to the hospital before this 2nd dose. She has not had to go to the hospital since the 2nd vaccine. She had been in and out of the hospital since Oct2021. She said it was a rehab or clinic, not a hospital. It was a nursing home that they turned to a rehab. She was admitted on 19 of Dec 2021 and stayed until 24Dec2021. She stayed for 6 days. This was in an alcohol detox center. She was not detoxing bad at all and she took a little Buspar while she was there. Since the vaccine she has been taking more. She needed it every 2-3 hours. Her husband also had a headache and fever. The next morning, they felt like poo poo. They felt really bad, more so her. His symptoms went away, but hers did not. She just had underlying back pain. She had high blood pressure, which was before the vaccine. She wanted to know if she should get booster dose or not. The severe headaches started in the morning as soon as she woke up; severe back pain started in the morning; anxiety was worse in the morning and afternoon it got worse toward 11:00-12:00; fever started in the morning. The events did not require visits to Emergency Room or Physician Office.; Sender's Comments: The event anxiety is assessed as an intercurrent condition that is unrelated to the administration of BNT162B2 vaccine.