Vomiting; broke out in sweats; it drained her so much; She was so sick; She was weak and soaking wet; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 78 year-old female patient received bnt162b2 (BNT162B2), intramuscular, administered in arm left, administration date 05Oct2021 (Lot number: 30135BA, Expiration Date: 28Feb2022) at the age of 78 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. Concomitant medication(s) included: SYNTHROID taken for thyroid disorder; HYZAAR taken for blood pressure measurement. Vaccination history included: Bnt162b2 (First dose, Lot:EL9262), administration date: 26Jan2021, when the patient was 78 years old, for COVID-19 immunization; Bnt162b2 (Second dose : 0.3mL IM Pfizer B BUD 30May2021; MT 12Feb2021  13/41 lot: EL9266 , caller said she got the vaccine on 16Feb2021 not 12 Feb 2021. But provided 12Feb2021 from the vaccine card.), administration date: 16Feb2021, when the patient was 78 years old, for COVID-19 immunization. The following information was reported: VOMITING (non-serious) with onset 05Oct2021, outcome "recovered" (06Oct2021), described as "Vomiting"; HYPERHIDROSIS (non-serious) with onset 05Oct2021, outcome "recovered" (06Oct2021), described as "broke out in sweats"; FATIGUE (non-serious) with onset 2021, outcome "unknown", described as "it drained her so much"; ILLNESS (non-serious) with onset 2021, outcome "unknown", described as "She was so sick"; ASTHENIA (non-serious) with onset 2021, outcome "unknown", described as "She was weak and soaking wet".  Additional Information: Patient called the health department who told her to report any reactions from the COVID 19 vaccine. She had not a reaction with the first two vaccines.She had the booster shot on Tuesday 05Oct2021.That night she was vomiting and regurgitating so bad she couldn't stop. She was know how much more could had been in her. It was red. She had not known what was in her that was red. She broke out in sweats; she was soaking wet all over. She wet the whole bed with sweat. She didn't have a thermometer near to take her temperature. She was so sick. It drained her so much. All she could do that Wednesday was stay in bed. She didn't feel like doing anything. It was gone by the next day. She guess it was the booster shot. She also had eaten much that day. She ate some candy that was on the table at the place she got the vaccine. She ate two candy bars. She doesn't know if it made her vomit. She is an active cancer patient. It is the COVID 19 vaccine. She took a picture of her card on her phone. She had to find it. When she had her first two shots, she hadn't started her cancer treatment or shots. She had her first immunotherapy and first shot for cancer a week or so before the booster. She will tell her oncologist how she vomited too. She was to go for one cancer treatment once a month. This stuff was complicated. She was taking Keytruda for urethral cancer. It was very rare. She gets treatment every 3 weeks. The other name for it was Pembrolizumab. She had not the NDC/lot/expiration for either of her cancer drugs. She was throwing up the next day. But that night, she had so much come out of her. She put two bags in a trash can. She set it in a box. She couldn't stop vomiting. It emptied her out. She was weak and soaking wet. She had to get a second vaccine card for the booster because she was not hand them her first one. She hadn't hardly eaten.  Patient was on hyzaar last 25 years. Her blood pressure is always good. Patient had not any history. Investigation assessment was not performed.  No follow-up attempts are possible. No further information is expected.