Arm didn't hurt that bad, but did start hurting; It set off her low blood sugar; kept having 2-3 attacks a week, of low blood sugar; and she kept having 2-3 attacks a week, of low blood sugar; Kind of felt unwell; confusion; Shakes was terrible and tremors; concerns with blood sugar; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 56 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 21Apr2021 (Batch/Lot number: unknown) at the age of 56 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Tremor" (ongoing). Concomitant medication(s) included: PRIMIDONE taken for tremor (ongoing); PROPANOL taken for tremor (ongoing). Past drug history included: Flu vaccine for Allergic to regular flu vaccine, notes: Allergic to regular flu vaccine. The following information was reported: BLOOD GLUCOSE FLUCTUATION (non-serious) with onset 2021, outcome "recovering", described as "concerns with blood sugar"; CONFUSIONAL STATE (non-serious) with onset Apr2021, outcome "recovered" (2021), described as "confusion"; TREMOR (non-serious) with onset Apr2021, outcome "recovering", described as "Shakes was terrible and tremors"; BLOOD GLUCOSE DECREASED (non-serious) with onset 21Apr2021, outcome "recovering", described as "It set off her low blood sugar; kept having 2-3 attacks a week, of low blood sugar"; HYPOGLYCAEMIA (non-serious) with onset 21Apr2021, outcome "recovering", described as "and she kept having 2-3 attacks a week, of low blood sugar"; MALAISE (non-serious) with onset Apr2021, outcome "recovering", described as "Kind of felt unwell"; PAIN IN EXTREMITY (non-serious) with onset 26Apr2021, outcome "recovering", described as "Arm didn't hurt that bad, but did start hurting". Therapeutic measures were taken as a result of blood glucose fluctuation, confusional state, tremor, blood glucose decreased, hypoglycaemia, malaise, pain in extremity.  Additional information: Caller stated that she had an appointment to receive second dose 12May2021. She experienced adverse events until 08May2021 from first dose 21Apr2021. Stated concerns with blood sugar, tremors, confusion and asked how to cancel the appointment on Wednesday 12th, as she had a side effect after the first dose of the vaccine. The day she got the first shot and her arm did not hurt that bad from it and she did not had any problems from sitting there the length of time you got to when you get it. After she got home, it set off her low blood sugar and she kept having 2-3 attacks a week, of low blood sugar and she kind of felt unwell too. Then she had a tremor but clarified that she had history of tremors before this too, but she had the shakes from the low blood sugar attack and the tremors. Her shaking was terrible. Now, with the problems she wanted to know if it would she be safe to take the second shot. Had another blood sugar attack of 20 and then that was when the arm started to hurt. That evening she started the shakes this was after the 26th or 27th of Apr. She also had been confused, but that had gotten better and did not start getting better until 08May2021, a few days ago. The shakes she had gotten along with the low blood sugar and it went on like that for may be a week. She was already on medication for her tremors anyway so it had been better since and they cleared up. Did not had the confusion or arm hurting anymore and her sugar level was back to what it was supposed to be. The arm pain started on 26th Apr, that Monday and it was better and she ended up taking like a couple kinds of Tylenol to help and by that Tuesday it was feeling a little better. Later caller clarified that she only took a generic Tylenol, Extra Strength Family Wellness Pain Relief 500mg. It was a Discount Store off brand, compared to Tylenol. Stated she would see if she read it and provides Lot number of DCE32 or 0, cannot tell the last number with expiry of Jan2022. States she took 2 tablets by mouth. No other vaccines the same time with this one, no other vaccines 4 weeks prior. She was allergic to the regular flu vaccine she had in past. Was to go to the doctor the 20May2021 for her blood work and a normal check up with her primary care provider. Patient's Medical History (including any illness at time of vaccination; other relevant medical history including but not limited to these conditions: diagnosed allergies, compromised immune status, respiratory illness, genetic / chromosomal abnormalities, endocrine abnormalities (including diabetes) and obesity): History of tremors. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available), Additional Vaccines Administered on Same Date of the Pfizer Suspect Vaccine Name, Prior Vaccinations (within 4 weeks prior to the first administration date of the suspect vaccine(s), relevant tests was none. The AE(s) did not require a visit to: Emergency Room/ Physician Office.   No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.