stated that she could not sleep; Vomiting/ Vomiting was reported as worsened; Diarrhea; Patient received third dose of vaccine; neck sore; left arm sore; stated that her weight has went down; clostridium; low grade fever; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 84 year-old female patient received bnt162b2 (BNT162B2), intramuscular, administered in arm left, administration date 20Nov2021 16:30 (Lot number: FH8030) at the age of 83 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Clostridium difficle", start date: 08Oct2021 (ongoing). Concomitant medication(s) included: LISINOPRIL; VANCOMYCIN taken for infection (ongoing). Vaccination history included: Bnt162b2 (Dose Number:01, Lot number:EN6198), administration date: 04Mar2021, when the patient was 83 years old, for Covid-19 Immunization; Bnt162b2 (Dose Number:02, Lot number:EN6208), administration date: 25Mar2021, when the patient was 83 years old, for Covid-19 Immunization. The following information was reported: IMMUNISATION (medically significant) with onset 20Nov2021, outcome "unknown", described as "Patient received third dose of vaccine"; CLOSTRIDIAL INFECTION (medically significant) with onset Nov2021, outcome "not recovered", described as "clostridium"; NECK PAIN (non-serious) with onset 20Nov2021, outcome "recovered" (21Nov2021), described as "neck sore"; WEIGHT DECREASED (non-serious) with onset Nov2021, outcome "unknown", described as "stated that her weight has went down"; INSOMNIA (non-serious) with onset 21Nov2021, outcome "recovered" (2021), described as "stated that she could not sleep"; PYREXIA (non-serious) with onset Nov2021, outcome "unknown", described as "low grade fever"; PAIN IN EXTREMITY (non-serious) with onset 20Nov2021, outcome "recovered" (2021), described as "left arm sore"; VOMITING (non-serious) with onset 21Nov2021, outcome "recovered" (2021), described as "Vomiting/ Vomiting was reported as worsened"; DIARRHOEA (non-serious) with onset 21Nov2021, outcome "recovered" (2021), described as "Diarrhea". The patient underwent the following laboratory tests and procedures: body temperature: (Nov2021) low grade fever; culture stool: (14Oct2021) clostridium. Therapeutic measures were not taken as a result of neck pain, insomnia, pain in extremity, vomiting, diarrhoea. The reporter stated that she was fine and went for her Covid booster on Saturday around 4:30pm. Stated that she did shopping, had something to eat, went to bed and at 2:30am woke up. Her arm and neck were sore like someone was pushing on her chest. Stated that she came down with a very bad case of diarrhoea. On Sunday morning she could not sleep. She woke up on 2:30 Sunday morning and had to stay awake until 5:30 and tried to go to sleep again. All day was bad, she had diarrhoea and was wiped out. All she wanted to do was go to bed. Stated that Sunday and this morning she had to go to the bathroom and had diarrhoea and vomiting. She had to put some food down and it came up. In morning the diarrhoea seems to be letting up. She went to the bathroom at 6:45 and 7:30 and she had not gone in the past 1.5 hours with no diarrhoea or vomiting. She cannot hold any food on her stomach, her weight has gone down. Wanted to know if this was a side effect from this. Event details was stated that her arm was sore under it about 3 hours after the shot, it was sore if one touches it, her neck was no longer this morning when she woke up. She could not sleep from off and on going to the bathroom, she tried to have a little coffee and it came up. There was no treatment. Patient experienced left and neck arm soreness, diarrhoea, vomiting and could not sleep. Patient wants to know if these are normal side effects from the vaccination. Patient stated that when she eats something, it usually comes out after the meal. The patient added that last night she just had a potato. She tried to eat something, whatever she put in there it all come out. Patient received her vaccination on Saturday at 4:30 or 4:45PM, everything started at 2:30AM in the morning. At first, there was no vomiting, later on the second day in the afternoon and in morning, she experienced vomiting. The reporter added that, she only took her medications yesterday for thyroid and Lisinopril after finishing throwing up, she was still down. Patient stated that it was terrible yesterday. Patient mentioned that she still has diarrhoea and was not able to eat. The patient afraid she had lost weight just over 2 days. Patient asked recommendations on what to do, if these were normal side effects. patient stated that her husband went with her, and he was fine. The reporter cannot remember being so sick for three days. Could not hold food down. Had diarrhoea, low grade fever, pain in neck and arm. Spent one and half day in bed. Took three days before and felt somewhat better.  No follow-up attempts are possible. No further information is expected.