it was not liquid coming out of my rectum but a grey/taupe very soft stool; gassy; my stomach and back side were very pain full; sour belches; vomited; having dark liquid diarrhea pouring out of my rectum; I could not sleep; my entire stomach area was swollen and in extreme pain just to touch; my entire stomach area was swollen and in extreme pain just to touch; my back side was raw and bleeding; This is a spontaneous report from a contactable consumer (patient). A 56-year-old female patient (not pregnant) received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE) via an unspecified route of administration, administered in left arm on 08Apr2021 18:45 (Lot number was not reported) as single dose for COVID-19 immunisation. Medical history included blood pressure (BP), sleeping, cholesterol. Patient had no covid prior vaccination. Concomitant medications included calcium and unspecified Multi Vitamin. No other vaccine in four weeks. The patient previously took erythromycin (EMYCIN) and experienced allergies, hydrocodone bitartrate/paracetamol (VICODIN) and experienced allergies. The patient experienced her back side was raw and bleeding on 12Apr2021, sour belches on 12Apr2021 08:00, vomited on 12Apr2021 08:00, having dark liquid diarrhea pouring out of her rectum on 12Apr2021 08:00, could not sleep on 12Apr2021, her entire stomach area was swollen and in extreme pain just to touch on 12Apr2021, her stomach and back side were very pain full on 13Apr2021, it was not liquid coming out of her rectum but a grey/taupe very soft stool on 14Apr2021, gassy on 14Apr2021. No treatment received. No covid tested post vaccination. Clinical course: She received the first Pfizer vaccine on 08Apr2021 evening, she thought it was easy, no problems. 12Apr2021 morning driving to work she started having sour belches, she got to work and ran to the bathroom, she vomited #6 times while having dark liquid diarrhea pouring out of her rectum, it finally stopped, 3 hours later it started again, she vomited 4 more times with more dark liquid pouring out of her rectum. Her boss sent me home. At home she was running back and forth to the bathroom the rest of the day with dark liquid diarrhea and another vomiting session throwing up #5 more times for a total of #15 Times. She could not sleep as her entire stomach area was swollen and in extreme pain just to touch and her back side was raw and bleeding. 13Apr2021 morning she vomited 3 times along with still having dark liquid diarrhea pouring out of her rectum and her stomach and back side were very pain full. 14Apr2021 she could not go to work again, she had no vomiting but continued with the on going dark liquid until 3:00 PM, she went to the bathroom and it was not liquid coming out of her rectum but a grey/taupe very soft stool. Her stomach area continued to hurt, she was still gassy. She only ate a banana, toast and Gatorade per the Dr. This was such a horrible experience. After the first shot she was praising the Pfizer Shot, now she would not. She did no really want the second shot after this experience. She was a new widow struggling, she had no one to help her, she had no phone as she had thrown up on her new phone and ruined it. This was such a terrible experience. The outcome of the events was recovering.   Information on the lot/batch number has been requested.