She was wiped out the next day with aches and pains still.; tired; brain fog; started to get cold; shake/her hands were shaking so hard; they took her temperature and it was 100/her fever went to 101/temperature had gone to 102.6; heart rate was elevated at 100/heart rate was 110/heart rate went to the high 120s; headache; backache; nauseated; chest was hurting; The initial case was missing the following minimum criteria: Invalid for unspecified adverse event. Upon receipt of follow-up information on 08Jan2021, this case now contains all required information to be considered valid.  This is a spontaneous report from a contactable nurse (patient). A 54-year-old female patient received 1st dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, lot# EK5730), via an unspecified route of administration in deltoid left on 29Dec2020 07:30 at single dose for COVID-19 immunisation. Medical history included ongoing sleep apnoea (diagnosed about 3-4 years ago, wear her CPAP religiously), Hashimoto's hypothyroid, and chronic low vitamin d (lack of sunlight). Concomitant medication included levothyroxine sodium (SYNTHROID) from 2016 and ongoing for Hashimoto's hypothyroid, ergocalciferol (VIT D) from 2018 for chronic low vitamin d; lack of sunlight (She did not take it religiously, but was supposed to take it everyday). At 10:30 AM (29Dec2020), she started to get cold and shake. She thought that this was insane and it was in her head. It became so severe she could not use her computer her hands were shaking so hard. She went back up to where they were giving vaccines, they took her temperature and it was 100. It had been normal the morning before she got the vaccine. Her heart rate was elevated at 100. They put a blanket on her and said they wanted to watch her for 15 minutes. In that time her fever went to 101 and her heart rate was 110. They took her to the ER. She was there for 5 hours. Her heart rate went to the high 120s. They did a 12 lead EKG. Her temperature had gone to 102.6, which was the highest. They gave her a liter of Normal Saline. She also had a headache, backache, and felt nauseated. The liter of fluid helped, no doubt. She was not admitted. She was wiped out the next day (30Dec2020) with aches and pains still. Their concern was they said they did not give her epinephrine because her heart was too high. She had no breathing issues. Just extreme cold. At one point she had woke up in the ER (29 or 30Dec2020) and her chest was hurting, she knows from her heart rate being too fast. She was so cold. She had on 6 blankets. The next day (30Dec2020) she still had the aches and pains, she was tired, and had brain fog. It all went away on 30Dec2020. She had nothing after that. What scared her was the heart rhythm. The ER doctor says its not great, but felt that getting the second dose was better than her having COVID. The Electrophysiologist she saw, said she was unsure if she should get the second dose. The hospital said that for this next dose, they would give her the injection, wait 15 minutes, then send her home, expecting that she would have the same thing happen. When after the first dose, she was in the ER on a 12 lead EKG with an intravenous (IV). She had no arm pain the whole time. The reporter assessed all events related. She felt fine prior, walking in to get the vaccine. But she was much better the next day and recovered completely. She was just worried about the second dose. The outcome of events was recovered on 30Dec2020.; Sender's Comments: Based on the compatible temporal association and the drug's known safety profile, the vaccination with BNT162B2 might play a contributory role in triggering the onset of the reported events. 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.