Knotted up my neck within seconds; Feels like someone ran me over with a baseball bat; Right shoulder was sore where he got the shot, but now states his left shoulder is sorer; This is a spontaneous report from a contactable consumer (patient). A 61-year-old male patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Formulation: Solution for injection, Lot number and Expiration Date was not reported) via an unspecified route of administration on 15Apr2021 as dose 2, single for COVID-19 immunization (at the age of 61-year-old). Historical vaccine included BNT162B2 (Lot number and Expiration Date was not reported) via an unspecified route of administration on an unspecified date for COVID-19 immunization and experienced Knotted up my neck within seconds. The patient's medical history and concomitant medications were not reported. The patient experienced knotted up my neck within seconds, feels like someone ran me over with a baseball bat, right shoulder was sore where he got the shot, but now states his left shoulder is sorer on an unspecified date. It was reported that, before he received the Pfizer BioNTech COVID-19 vaccine, he was tested for antibodies which came back negative. Patient wanted to know if he were to test for antibodies now that he has received both doses of the vaccine, would he test positive. Patient wanted to know the "life span" of the mRNA component of the Pfizer BioNTech COVID-19 vaccine. Patient was concerned about the polyethylene glycol (or PEG) component of the Pfizer BioNTech COVID-19 vaccine and how it was metabolized in the body, if at all. He stated that he has done some research that stated people could generate "immune antibodies" to PEG. He stated that he had read that this suspension has been used in other injection that have caused people to have "negative and deathly ill" reactions. He was concerned for himself because he felt like the PEG component and possible development of antibodies could lead to him generating a negative reaction response in the future if he had to take another dose of the vaccine (caller has already received his second dose of the vaccine at this time). He mentioned that after his first dose of the vaccine, he experienced knotted up my neck within seconds. He also reported that both he and his wife (who was also 61 years old) experienced this same sensation with the second dose, which they both received yesterday. After his second dose it felt like someone ran him over with a baseball bat and initially his right shoulder was sore where he got the shot, but now his left shoulder was sorer. He spoke with other people after getting their vaccines and they reported tiredness. They need to be checked antibodies to PEG and antibodies to COVID-19 in the participants. He suggested that they should be taking blood of out all the people in phase 3 and cataloguing everyone to see if they started showing positive or negative and states that this information should be made public. He suggested that Pfizer find some other properties of natural lipids that they could use instead of PEG and people should know what vaccine they're' getting and people should be informed. The outcome of the events was unknown.   No follow-up attempts are needed; information about lot/batch number cannot be obtained.