very serious extreme anxiety; nausea, severe nausea, where she couldn't eat; Severe Headache; Abdominal pain; Dry heaves; she had a morbid feeling; feeling of doom; lost 13 pounds; hypothyroid went to hyperthyroid; Aversion to Food; Anorexia; nausea, severe nausea, where she couldn't eat; This is a spontaneous report from a contactable Nurse (patient). A 78-years-old female patient received bnt162b2 (BNT162B2), dose 2 via an unspecified route of administration, administered in Arm Left on 11Jan2021 10:50 (Batch/Lot Number: EJ1686; Expiration Date: 20Mar2021) as 2ND DOSE, SINGLE, vaccinated at the age of 78 years old for covid-19 immunisation. Patient received the first dose on 21Dec2020. Medical history included ongoing hypothyroidism Diagnosed 20 years ago, ongoing colitis, ongoing proctitis, ongoing diverticulum, ongoing gastrointestinal pain, and breast cancer. Concomitant medications included levothyroxine sodium (SYNTHROID) taken for hypothyroidism, start and stop date were not reported. Caller states she was told by a couple of doctors that she needed to report this. Caller states her first vaccine was 21Dec2021 and then her second dose was on 11Jan2021. Caller states four days after the second dose, she wound up in the ER with severe headache, abdominal pain, dry heaves and she had a morbid feeling. Caller states after that, she saw her doctor and for two months she had problems with nausea, severe nausea, where she couldn't eat, lost 13 pounds, hypothyroid went to hyperthyroid, very serious extreme anxiety, which she is still battling. Caller states the Endocrinologist felt it could've been associated with the vaccine. Caller states the ER ran tests and abdominal scans and all they showed were the usual things she knew she had, nothing new. Caller states she asked the ER doctors, and they said they didn't know if it was related and when she asked Endocrinology, they said they don't know for sure. Caller states her Primary doctor said it could be related, anytime a person has a vaccination, if they are immunocompromised or have inflammation, it can possibly trigger this and events occur. Caller states she had dry heaves, an aversion to food, lost weight, and had terrible anxiety, all four days after vaccine. Caller states after the first vaccine, she was fine. Caller states after the second vaccine, she woke up that morning four days after, it was acute, this had never happened before and she had a feeling of doom and dry heaving. Caller states it took her two months, before she started to eat and put the weight back on. Caller states the nausea is gone and she is able to eat and put weight back on. Caller states she still has extreme anxiety and she is seeing a doctor for that and is being medicated so it is persisting by improved with medicaiton. Caller repeats, this all happened four days after her second injection. Caller states no one knows that much about the vaccine but they said something that this reaction should be reported. Caller states the nausea and other GI issues lasted for about two months, but she can't give actual dates of when it recovered. Caller states she doesn't know dates of when the other side effects recovered, but they only thing she still has is the anxiety. Seriousness: Caller states the Nausea was disabling, she couldn't eat at all, she had to drink ensure and boost. Caller states the rest were medically significant. She was worked on by her PCP and Endocrinologist, and they adjusted her thyroid medication to bring back down her levels, and she is sure that is part of the reason for her anxiety and anorexia. Caller states before she had hypothyroid. Treatment: Suppositories, Zofran, Reglan, Anxiety Medication, Adjustment of the thyroid medication Synthroid. States when she lost an extreme amount of weight, her thyroxin increased, so they dropped her dose to the normal range. Causality: Caller states she feels it is related because it was an acute onset and rare for her, even though she is older, she is healthy. Caller states she has had breast cancer but nothing that stopped her from working. Caller states it is hard to know, but she thinks it is related. Caller states her one son was home and called and said mom looks like she is going to pass out and she is not an alarmist and usually would say no, but she said yes, he better make sure that she gets to the ER, she felt impending doom, with abrupt onset. Tests: Caller states they did an Endoscopy and Colonoscopy because of her abdominal pain and they found colitis and proctitis and every, itis, a person can think of along with diverticulosis and inflamed gut, but she already had those, they were not caused by the vaccine, she had them in the past. Outcome of anxiety was recovering, of others was recovered in Jan2021.; Sender's Comments: Based on the temporal relationship between events anxiety, nausea, headache, abdominal pain, retching, malaise, weight decreased, hyperthyroidism, decreased appetite, eating disorder and company suspect BNT162B2, the causal relationship cannot be denied.     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.