hypoglycemic shock; positive for covid 19; mobility issues; gets out of breath easily; weak; couldn't remember anything which wasn't normal; WBC was elevated; headaches; went sky high into the 500s and they couldn't control it in the hospital; viral pneumonia; renal failure; Her blood sugar was 28; Covid fog; was not eating or drinking; throw up; This is a spontaneous report from a contactable consumer or other non-health care professional (patient daughter) via Pfizer. A 63-year-old female patient received first dose of bnt162b2 (Pfizer-BioNTech Covid-19 Vaccine, solution for injection, Batch/Lot number was not reported and expiry date unknown) via an unspecified route of administration on 25Mar2021 (at the age of 63-year-old) as 1st DOSE, SINGLE for covid-19 immunization. Patient took vaccine as she wanted to fly on an airplane and not worry as heavily. Medical history included ongoing diabetes mellitus, patient had diabetes for at least 5 years, ongoing high blood pressure from an unknown date, reporter think patient high blood pressure was more with her weight because patient was obese. Patient was immunocompromised with her diabetes. Patient had no relevant family medical history. Concomitant medication included ongoing metformin (METFORMIN) taken for diabetes mellitus. Patient has been on it for years. Reporter believed she was on the max dose that she thinks was 2000mg, but could be wrong. Patient was not eating or drinking from 03Apr2021 and did throw up. On 06Apr2021 patient was tested positive for Covid and experienced hypoglycemic shock at 11:00, renal failure and Covid fog. Reportedly, patient also experienced viral pneumonia, mobility issues, gets out of breath easily, weak, her blood sugar was 28, covid fog, couldn't remember anything which wasn't normal, wbc was elevated and headache. The patient was hospitalized for hypoglycemic shock and COVID-19 from 06Apr2021 to 17Apr2021 (11 days), then discharged and was told by her HCP to wait 8-12 weeks before getting second dose of Pfizer covid vaccine. Patient scheduled to receive second vaccine dose 15May2021. Reporter was told that it was a max of 42 days that patient can get the second dose of the vaccine, but that has obviously since passed. They want patient to come in and get a second first shot. When patient was admitted, the doctor thought patient had viral pneumonia already for at least a week, so it would have started about when she got the shot. Patient was better, she was not on oxygen anymore, but she still gets out of breath easily. Patients mobility issues started when she came down with symptoms. Patient had renal failure and was weak. Patient was not eating or drinking. Patient was diabetic and she had hypoglycemic shock which was what put her in the hospital. Reporter thought it was probably a cold or flu or something and Easter happened where she was not hungry and did throw up. Reporter thought it was something she ate that was bad. When she had the hypoglycemic shock reporter could not wake her and patient was in some kind of unresponsive state from 11:00 to about 15:45. Patient blood sugar was 28 when the paramedics arrived. They were able to get her responsive and transferred her to the hospital. They ended up putting her on a dextrose drip because they could not keep her blood sugar up. They put her on steroids and the number went sky high into the 500s and they could not control it in the hospital. There was a lot of stuff that happened. Reporter did not believe that patient has any lasting effects from the hypoglycemic shock. Patient sugar was back to normal and she was on her normal medications. Patient was off insulin which they gave her in the hospital, so that part was okay. Patient was dealing with Covid fog also. Reporter does not know if it has to do with blood sugar or how the virus attacks the body. Patient had multiple MRIs because they were worried, she had a stroke, and she said she could not remember anything which was not normal. Patient not eating and drinking started right before Easter and was much better. Reporter believed that at about 14Apr2021 or so patient started to eat better and have more of an appetite for food. Patient has recovered completely. The reporter did not notice the Covid fog until her mother was in the hospital on 06Apr2021. She does not remember her first week in the hospital, and then even when she was discharged on 17Apr2021 that whole next week she was still very foggy. The reporter would say she was better now. patient talks normally and was back to swearing which is perfectly her. Patient has recovered completely at this point. Patient mobility was better. Patient was not using the walker in the house today, and her balance was better. It was probably due to some of the side effects of the medicines they added like a beta blocker and other things to make sure she was okay. Regarding kidney failure started, reporter stated on 06Apr2021 patient creatinine was 3.99. Patient also had a high D dimer and were worried about her clotting and throwing a PE or something. That was mostly in the first few days around the 6Apr2021, 7Apr2021, 8Apr2021, 9 Apr2021, 10Apr2021 when they were not sure what was going to happen. The following week patient was still at 5 to 6 liters of oxygen, but by Friday night 16Apr2021 she was down to 1 liter of oxygen. Patient did not come home on oxygen. Reporter believed patient kidneys have recovered, but she did not know. The patient underwent lab tests and procedures which included blood creatinine: 1.47 on an unknown date, 0.97 on Sep2020, reporter does not know if it returned to 0.97, but the last number she knows of was 1.47, 3.99 on 06Apr2021, blood creatinine: 1.47 on 17Apr2021. Patient had normal bloodwork in Sep2020 and her creatinine was 0.97. Reporter did not know if it returned to 0.97, but the last number she knows of was 1.47. That would have been when patient was discharged from the hospital. Blood glucose: 500s on an unknown date in Apr2021, blood glucose: 28 on 06Apr2021. On 06Apr2021 patient was tested positive for Covid. On an unknown date patient got CT, high d dimer, CBC, MRI, metabolic function test, white blood cell count, X-ray and Chem 28. Reportedly, bloodwork were done daily in the hospital, and patient has had bloodwork once since she was discharged. WBC was elevated so they did a blood culture to make sure patient did not have an infection. The culture was negative. There were no additional vaccines administered on same date of the Pfizer suspect. There was no prior vaccination within 4 weeks. There were predisposing factors diabetes and immunosuppression. Patient started Tylenol pill on 06Apr2021 after vaccination at an unknown dose. They gave it to her continuously because she had bad headaches. They started her on antivirals and took her off of Remdesivir because of her kidneys. They put her on a different antiviral that the reporter did not remember the name of and a biologic. Home health just discharged patient, and she was still dealing with viral pneumonia and mobility issues. Patient was still on different medicines and she normally was not. The report is related to study or programme. The outcome of the event hypoglycemic shock was recovered on 06Apr2021 and was not eating or drinking was recovered on 14Apr2021, viral pneumonia, mobility issues, was recovering, renal failure, positive for covid 19, gets out of breath easily, weak, her blood sugar was 28, went sky high into the 500s and they couldn't control it in the hospital, covid fog, couldn't remember anything which wasn't normal, wbc was elevated, throw up and headaches was unknown.   Follow-up attempts are completed; information about lot/batch number cannot be obtained