They were so bad she could not breathe.; Bleeding Ulcer; Diarrhea; vomiting; weak; tired; She was not sore after getting either one.  Then she said it was very little; This is a spontaneous report from a contactable nurse (patient). An 85-years-old female patient received second dose of bnt162b2 (PFIZER-BIONTEC COVID-19 VACCINE, Solution for injection, Lot Number: not reported), via an unspecified route of administration, in the right arm on unspecified date at 12:30 (at the age of 85-years-old) as dose 2, single for prevention. Medical history included arthritis (diagnosed years ago), allergies, compromised immune status, respiratory illness, genetic/chromosomal abnormalities, endocrine abnormalities (including diabetes) and obesity. Prior to vaccinations, no other vaccinations received within four weeks. Concomitant medication included amlodipine (MANUFACTURER UNKNOWN, Strength: 10 mg) for high blood pressure, Motrin and Excedrin, Turmeric and iron ((MANUFACTURER UNKNOWN) and vitamin D, C and folic Acid ((MANUFACTURER UNKNOWN), she has been taking it for years. Patient had previously received first dose of bnt162b2 (PFIZER-BIONTEC COVID-19 VACCINE), on unspecified date (at the age of 85-years-old) as dose 1, single for COVID-19 immunisation and had no soreness or no reaction. Patient did not receive other vaccine in four weeks of vaccination. No events following prior vaccinations. On 26Jul2021, patient had diarrhea and vomiting (hospitalised from 28Jun2021 to 01Aug2021) and they were so bad she could not breathe (hospitalised), very weak and tired. On 28Jul2021, patient had bleeding ulcer (hospitalised from 28Jul2021 to 01Aug2021) and was in hospital for 7 Blood Transfusion. On Saturday, she got her second dose. She ended up in hospital early Tuesday morning, which she later stated was Wednesday. She received 7 blood transfusions. She was bleeding with an ulcer which she has no pre-existing conditions. Her primary care was 100 miles away from her. She moved there 6 months ago and he really did not take care of her for this. She was just in the hospital in an emergency, and they took care of her in the hospital. As of now, she has no primary. Diarrhea and vomiting occurred in the middle of night when she went to hospital. They were so bad she could not breathe. She was still very weak and tired. They started blood transfusion on 28Jul2021 about 2 hours after arriving to hospital. First dose received was 3 weeks before second dose. Second dose was unknown as well. It was the Saturday before she went into hospital. She was not sore after getting either one. Then she said it was very little. She was unable to confirm if either dose was given in the muscle of her right arm. She had been taking some Motrin and some Excedrin. 1 Excedrin a day and 2 Motrin 200 mg each. She takes Turmeric and iron and vitamin D, C and Folic Acid. She has taken them for years. She was relatively healthy. She never had anything like this before. The vomiting did not start until the actual time she went into the hospital.  It was mostly diarrhea for 3 days and then vomiting and then massive diarrhea before she went in early Wednesday morning. She went to Emergency Room and they gave her IV Fluids. She was very dehydrated. They could not get her blood pressure up. They almost coded her twice. She was transferred to hospital where she was admitted. The patient admitted on 28Jul2021 and released on 01Aug2021. She thought it was very unusual and she wanted to report it. The outcome of events bleeding ulcer, diarrhea and vomiting, they were so bad she could not breathe was resolved with sequel in 2021 and for other events was unknown.  Pfizer COVID vaccine: Bleeding Ulcer, Diarrhea and vomiting, 7 Blood Transfusion - Related  Lot/batch number has been requested.; Sender's Comments: based on the available information the  causality between events  Bleeding Ulcer ,Diarrhea and vomiting,Blood Transfusion and the suspect vaccine BNT162B2 cannot be ruled out  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