Blood sugar dropped to 48; insulin use has gone down by 80 percent after getting the vaccine; Insulin sensitivity has doubled; memory is so bad; maybe we have found the cure for Type I diabetes because he is using less insulin in trying to get the same result; Blood sugar dropped to 48 and passed out; This is a spontaneous report from a contactable consumer (the patient). A 56-year-old male patient received BNT162B2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, dose 2 via an unspecified route of administration, administered in arm left on 24May2021 (Batch/Lot Number: EW0171; Expiration Date: Aug2021) as DOSE 2, SINGLE (at the age of 56 years-old) for covid-19 immunization. Medical history included cardiac disorder from 22Jun2021 to an unknown date, type 1 diabetes mellitus from an unknown date and unknown if ongoing, pneumonia  and patient wears a heart monitor on 22Jun2021 (they think he has a valve issue going on).  He mentioned he was on other medications, but does not think it was related. Historical vaccine included BNT162B2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, lot number: EW0171, expiration date: Aug2021), single dose, dose 1, in the left arm on 03May2021 at 4:30 PM and was almost put in the hospital with walking pneumonia, atypical pneumonia from 06May2021 to May2021 for 5 days (reported as recovered).  It lasted about a week. They did everything they could to keep it out of his lungs. If it had gone into his lungs he would have lost one of his lungs. He mentioned he has pneumonia so many times in the past, he was told if he had it again he would lose a lung. He confirmed this almost put him in the hospital. The patient's insulin use has gone down by 80 percent after getting the vaccine which is unheard of on 20Jul2021, blood sugar dropped to 48 and passed out on 20Jul2021. His blood sugar dropped around 10:30 and he got the hospital around 11:00. The patient reported that diabetes is different, it is not the same as it was before the shot and Insulin sensitivity has doubled and memory is so bad. He has been to the hospital two times. His disease is completely different than before the shot. He reported that sugars, started to go all over the place. There was like no control over his sugars at all. He had no diabetic control , absolutely none at all. He stated it was like a different disease, he clarified as his insulin sensitivity doubled. He stated even long acting insulin was making him drop low, where it should have maintained a basal it did not. The insulin sensitivity went so high. He initially stated he had to chalk everything by 50% and that is unheard of. In regards to insulin sensitivity doubling he stated he did not have prefect control to begin with, but it was decent. Now he has no control. It's been like this ever since the shot. He has been fighting his blood sugar since the shot. Stated it is unknown what the issue is. He mentioned, he got out of the hospital yesterday. Yesterday, his blood sugar dropped dangerously low. It was so low and he was on a ladder when it happened. He reported that he cannot work or do anything. He clarified and confirmed he was not administered to the hospital, but was just in the Emergency Room. They did not admit him because they got everything panned out and gave information about doctor to figure out where to start. The patient had an episode of low blood sugar between the first and second shot.. He went to the Emergency Room where they got the sugar back up and then it stabilized and was sent home. He confirmed he was not admitted to the hospital. Since then, it progressively got worse from that point forward. This occasion his blood sugar dropped to 22. Stated, maybe, he does not know maybe we have found the cure for Type I diabetes because he is using less insulin in trying to get the same result. the insulin he has cut by 50%. Novolin N - Has the box, Lot LZFS270, List# 183402, Exp- Jun2023 Humalog - He clarified he has cut the use by 30%, it is short acting. However, he does not have packaging to provide a lot/exp/NDC. He further clarified an overall 80% reduction in insulin is unheard of. The patient underwent lab tests and procedures which included blood glucose: dropped to 22, blood glucose: dropped to 48  on 20Jul2021. He went to the emergency room, 20Jul2021. Therapeutic measures were taken as a result of insulin use has gone down by 80 percent. The outcome of insulin use has gone down by 80 percent and passed out  was unknown. Prior Vaccinations (within 4 weeks): None, AE(s) following prior vaccinations: None.