he was not comfortable; allergic reaction; dizziness; feeling a lot of pressure in his head like his "brain wanted to pop out of his head"/ his brain wanted to swell up; felt like he was going to lose his mind / go crazy; fever; headache is recurring- worse at bedtime; almost passed out; This is a spontaneous report from a contactable consumer reporting for himself. A 61-years-old male patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE; Lot number: EL9621), intramuscular on the left arm on 22Jan2021 (reported as 07:45 to 08:00) at a SINGLE DOSE for prevent COVID, at 61 years old. Medical history included triple bypass surgery from an unknown date. There were no concomitant medications.  The patient previously took morphine and experienced the same thing with his brain, almost identical to what he was experiencing after the COVID vaccine. He reported that the first time he received morphine it was fine and then he got a shot of morphine and he experienced the pressure on his brain after receiving morphine, about 5 or 6 years before reporting time. He stated it was almost the same reaction. He was given a shot of Demerol (he was not sure if it was Demerol) to counteract it. History of all previous immunization reported as none. No additional vaccines administered on the same date. No prior vaccinations within 4 weeks. The patient reported he experienced an "allergic reaction"/ bad reaction to his first dose of BNT162B2 on 22Jan2021. His symptoms included dizziness as soon as he got the vaccine, got dizzy right off the bat, still dizzy, very little; feeling a lot of pressure in his head like his "brain wanted to pop out of his head"/ his brain wanted to swell up; felt like he was going to lose his mind / go crazy; fever; headache is recurring- worse at bedtime. Symptoms (unspecified which) reported as recurring and are notably worse at bedtime. Patient is hesitant to receive the second dose. The patient stated he just went to sleep and prayed and then when he woke the next day, at night it did it again. At night it comes and goes, and he still has it happen but not like the first time. He tried to describe that he was washing his hands and he almost passed out like on an unspecified date in Jan2021, he was going to lose his mind. Last night he went to bed no problem, he felt a little pressure on his brain, stated it is hard to describe, it was not a good feeling. He was running a fever. Last night he had a slight fever, like it was going away. He was not able to drive when this was happening and today was the first day he could drive and he was not comfortable (27Jan2021). The patient declined any treatment. He already talked to his doctor and was told to call Pfizer. He asked if he was to get the second shot, is there something he could to take to make that feeling go away or counteract it. No relevant tests were reported. Events did not require a visit to the emergency room nor physician office. The outcome of the events, allergic reaction, headache is recurring- worse at bedtime, almost passed out and he was not comfortable was unknown. Outcome of the events dizziness, "feeling a lot of pressure in his head like his brain wanted to pop out of his head/ his brain wanted to swell up", felt like he was going to lose his mind / go crazy, and fever was reported as recovering.