Regain 10 pounds or 30 pounds that I lost; My balance is probably 90%; Had muscle tremors so bad that I collapsed 5 times in one day; Fatigue; Reoccurring brain fog; brain fog was worst. I could remember talking to people; Muscle got so weak that I could not even stand up; redness; This is a spontaneous report from a contactable consumer (patient). A 70-Years-old male patient received first dose of f BNT162B2 (PFIZER-BIONTEC COVID-19 mRNA VACCINE, Solution for injection, lot number: EK9231 and expiry date: 31Apr2021), via an unspecified route of administration on 07Jan2021 as dose 1, single for COVID-19 immunization PFIZER-BIONTEC COVID-19 mRNA VACCINE, Solution for injection, lot number: EK9231 and expiry date: 31Apr2021), via an unspecified route of administration on 30Jan2021 as dose 2, single for COVID-19 immunization. The patient medical history included parkinson's disease (diagnosed in January 2012) and took one and half tablets of Carbidopa and levodopa every 2 hour 25-100 mg (Not appropriately clarified, hence not captured in tab), spinal stenosis (diagnosed in September 2006), low vitamin B12 (diagnosed in first week of January 2021) and took a 1 ml injection every month for this and low testosterone (diagnosed in February 2018) and took injection 0.5 ml every Saturday, so once in a week. The concomitant medications include ibuprofen, carbidopa and levodopa. Consumer stated, he got both the Pfizer Vaccine shots and had what he was very unusual and very extreme reactions to the vaccine and he was wondering, if you folks were interested in learning the details of this and he just let you know he had compiled from my doctors a 5 page report on what happened to him and it includes a summary and detailed timeline. When probed for the name of the health care professional who administered the vaccine, consumer stated, it was a nurse at a clinic. He do not know what their name was, still experiencing the side effects: Consumer stated, yes he definitely still had some redness as a side effects. Consumer stated that he had been doing lab test since he had his first injection, every 2 weeks. He had been on lab tests for 3 months that most people probably have in their life and the results are available through the hospital and in his report, he had a visit summary from the ER visit and it includes all the tests and results. When probed for the current status of unusual and extreme reactions, Consumer stated, they worsened until about February 12 and then they had started to get better right, like he regain 10 pounds or 30 pounds that he lost, his balance was probably 90%. He still had little trouble with quick turns and tremors, he had muscle tremors so bad that he collapsed 5 times in one day. His muscle got so weak that he could not even stand up, that has got much better, that he could straighten his legs back. So basically, what left over was regular tremors, slight loss of balance, still considerable fatigue and reoccurring brain fog, he did not know if he mentioned that before but the brain fog was worst. He could remember talking to people. They have gotten better but still persisting. Consumer stated, no diagnosis at the ER when I left found no organic reasons as why I am having reactions, there is no conclusive evidence that it was the vaccine which caused it but everything else was eliminated (Clarification unknown). So, basically this was what they came up with and all this say in his report. Outcome of the events was unknown.   No follow-up attempts are needed. No further information is expected.