nasty headache; felt hot; Shivers; achy; Nauseous; eyesight/ felt like she was straining; sensitivity to light; eyeballs felt sore; cold sweats; when she talked, she felt like she had to close her eyes because of pressure; arm was hurting really bad; received the 2nd vaccine yesterday/ date of the first vaccine was 28Dec2020; This is a spontaneous report from a contactable nurse (patient). A 38-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE; lot number: EL1284, expiry date: 30Apr2021), intramuscularly on the left arm, deltoid on 14Jan2021 15:30 to 14Jan2021 15:45 at a single dose for COVID-19 immunization. Medical history included ongoing pernicious anaemia, a B12 deficiency diagnosed 2-3 years ago (she gave herself B12 shots and she cannot convert B12 through her food), and myomectomy (15 cm uterine fibroid, removed this past summer). Concomitant medication included ongoing cyanocobalamin (B12) for pernicious anemia. The patient previously received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE; lot number: EL1284, expiry date: 30Apr2021), intramuscularly on the left arm, deltoid on 28Dec2020 at a single dose for COVID-19 immunization; and a flu shot (the MA gave it in the back of her arm, it was pretty significant). The patient was a nurse and informed that she received the second COVID vaccine the day before report (14Jan2021). She woke up on the day of report on 15Jan2021 03:00 with a nasty headache, she felt hot, had the creepy crawly shivers, was achy and when she talked, she felt like she had to close her eyes because of pressure, and she was nauseous. She figured this was probably normal but she couldn't get a hold of her doctor and the hospital she worked at did not know what to tell her. She was wondering if she can take Tylenol or ibuprofen and has even thought about drinking caffeine, that it might help her headache. She didn't have a prescribing doctor as she got it at work. The first round of the vaccine she only had a super mild sore arm and a slight headache. She received the second vaccine at 3:30pm and then went to bed when she got home. She woke herself up at 3 am because her arm was hurting really bad. She started feeling like she couldn't keep her legs still. She felt hot, achy, and was shivering. She hasn't taken her temperature. When she woke up at 3 am she got on her phone, and her eyesight felt like she couldn't quite focus. It wasn't bad, but she felt like she was straining. Then her head started hurting at 5-7 am. She was very sensitive to light. She woke up and couldn't go back to sleep. She had cold sweats, and was shivering. Every time she stood up, she was chattering. She felt achy almost like growing pains. She woke up with the arm pain, and then 10-15 minutes later, she started feeling that creepy crawly feeling. She got up and the cool fan hit her, and she realized how bad she was shivering. The shivering intensified at times but hasn't gotten worse. She had just called employee health and realized that when her eyes were open when she was talking was when she felt nauseated. She has noticed the nausea in the past half hour. She did not know if it was related to the headache or what. She had to cover her eyes, her eyeballs felt sore. When she talked with her eyes open, she felt a little queasy. She was just straining to see. Her vision was not blurry but she can tell she was straining. She did not know if it was because of the headache and nausea. When she got out of bed, the cold fan did not feel cold but it made her shiver. She was a nurse was trying to be socially responsible as she did not want to get COVID. She was a little suspicious because of the headache after the first one. She hasn't been around anyone in a couple of weeks and had been working from home. She has not been exposed to people. She kept feeling like she needed to stretch because she was sore. The patient was tested for COVID pre-surgery (myomectomy) and was negative. She was also tested for COVID antibodies and she did not have any. She was vaccinated at a hospital facility. Patient received no other vaccines on that day. The adverse events did not require any visit to the emergency room or physician office. Patient did not receive prior vaccines in the previous 4 weeks. Outcome of the events cold sweat and "tested for COVID antibodies and she did not have any" was unknown, nasty headache was reported as worsened (not recovered), and the remaining events was not recovered. The reporter considered the events serious due to medically significant events and related to the suspect drug.; Sender's Comments: Based on the information currently available, a possible contributory role of BNT162B2 vaccine in the development of the events cannot be excluded. The impact of this report on the benefit/risk profile of the Pfizer product is evaluated as part of Pfizer procedures for safety evaluation, including the review and analysis of aggregate data for adverse events. Any safety concern identified as part of this review, as well as any appropriate action in response, will be promptly notified to Regulatory Authorities, Ethics Committees and Investigators, as appropriate.