patient is very confused; arm hurting; body pain; fatigue; uncomfortable feeling; fell; sick; fell asleep; unconscious; vomited all over herself; urinary tract infection; 'weakened state'; muscle aches; This is a spontaneous report from a contactable other hcp. A 86-years-old female patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Batch/Lot number was not reported), via an unspecified route of administration, administered in Arm Left on 15Jun2021 (at the age of 86-years-old) as DOSE 1, SINGLE for covid-19 immunisation. Medical history included covid-19 from Jan2021 to Feb2021, callers mother had covid back in Feb2021. The patient's concomitant medications were not reported. Patient had not received any other vaccines within 4 weeks prior to the COVID vaccine. On 16Jun2021 11:00 wednesday, the patient was found unconscious in the living room floor by a neighbor, had vomited all over herself, her arm hurting, muscle aches, body pain, very weak, was diagnosed with a UTI and patient was confused on an unspecified date. She has since been discharged home, is in a weakened state and was advised not to get the 2nd shot. Caller concerned that 2 individuals came over to her mothers house to administer the vaccine. Patient was advised no to receive the second dose Pfizer Covid 19 Vaccine by the doctor. Yesterday (16Jun2021), the caller's mother ended up in the emergency room with an adverse reaction: clarified her mother was discharged from the emergency room. The patient arm was still hurting. When asked if the arm hurting is improved, worsened or persisting, the caller replies it is probably about the same. Stated she was informed on Tuesday evening 15Jun2021 that an individual came to her mother's home and administered the first dose Pfizer Covid 19 Vaccine to the patient. The caller said she spoke to her mother at 11:00 on Wednesday 16Jun2021, had an uncomfortable feeling that someone came to her mother's home and administered her mother the first dose Pfizer Covid 19 Vaccine. At this time on 11:00 on Wednesday, 16Jun2021 was when the caller mother told the caller about her symptoms. The caller clarified the mother's symptoms all began less than 24 hours after the mother received the first dose Pfizer Covid 19 Vaccine. Patient has fatigue, body pain is persisting and being very weak is persisting. The caller has reached out to the doctor and had tried to get home healthcare in to help her mother get her strength back up. The caller said when her mother had come to with the neighbor, her mother said she was in the kitchen and fell and crawled into the living room and that was when the patient got sick all over herself. The caller mother just fell asleep and the caller believed her mother was unconscious at that point. Time the Vaccination was given in mid-afternoon. Patient was on the fence about receiving the Pfizer Covid Vaccine. Patient antibodies were probably just as good as the Pfizer Covid 19 Vaccine. Due to the patients age, she was capable of handling any possible side effects from the Pfizer Covid 19 Vaccine. The patient went ahead and set up to receive the Pfizer Covid Vaccine.The patient underwent lab tests and procedures which included blood test: normal, chest x-ray: normal on 16Jun2021. Events resulted in emergency room visit. The seriousness of unconscious was medically significant. The outcome of all events were unknown.  Information on Lot/Batch number has been requested.