low grade fever/a fever; it rose up to 100.1 degrees Fahrenheit at the highest reading; the lowest reading 99.1; body aches/achy all over his body; difficulty breathing/started having issues with his breathing; dizziness/his head felt funny; dizzy and foggy in his brain; brain fogginess/his head felt funny; dizzy and foggy in his brain; lack of energy/he does not have any energy/feeling weak; tiredness; he was not able to play guitar or do routine things; he had a long, deep sleep and he was sleeping a lot yesterday and all afternoon; coughing, not a dry cough, like a smokers cough with chogginess; hacking up mucus; This is a spontaneous report from contactable consumer (patient). A 46-years-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection, Batch/Lot Number: unknown) via an unspecified route of administration on 20Apr2021 (at the age of 46-years-old) as dose 2, single for covid-19 immunisation. Medical history included CHF (cardiac failure congestive), asthma, he had some kind of sleep apnea issue from an unknown date and unknown if ongoing. The patient concomitant medication included patient was on methadone for past addiction. Historical vaccine included bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: Solution for injection, Batch/Lot Number: unknown) via an unspecified route of administration on an unspecified date as dose 1, single for covid-19 immunisation and experienced tired and nauseous. Was not bad went away quick, felt more like himself after the second vaccine, it was almost an antidote to the first one. Patient really started feeling better after the second one, all energetic. Caller stated, he got the 2nd dose of Pfizer vaccine 20Apr2021, well when he got the 2nd dose he had no issues. A little less than a month after the 2nd dose now, just yesterday and he not sure what caused the feeling, Caller reported starting to experience low grade fever, body aches, difficulty breathing, started having issues with his breathing, the breathing he had issues with sometimes, he had congestive heart failure and asthma so it was his normal sometimes. Caller stated, he was not as foggy this morning as yesterday no fever since yesterday morning, he took Tylenol yesterday and before bed, and again with his medications this morning. Caller asked if this is normal after a month of getting the vaccine? He reported he did not, he felt fine until now, it was been almost a month away from the second dose. Caller reported he woke up yesterday morning was achy but had not breathing issues at first. He was on oxygen, so he used that. He woke up achy all over and woke up earlier than normal. He reports he was disabled and did not work, so he was at home. He had the achiness all over, a fever; it rose up to 100.1 degrees Fahrenheit at the highest reading; the lowest reading 99.1. Then he got up and took Tylenol and it seemed to kick the fever down but, he was still achy. He also reports a lack of energy. He had routine of things to do normally, like normally he played his guitar but, he was not able to play guitar or do routine things. He just had no energy. Also, his head felt funny; dizzy and foggy in his brain was the best way he can describe it. This was all day yesterday. Caller reported he got a test for COVID yesterday and should find out the results today. Caller reports he takes a lot of medication and did not know if the would interact with the shot or not because he had heart problems. Caller reports his heart problems started way before the vaccine, he has had the Congestive Heart Failure long before that. He had been on disability for his congestive heart failure for years before the vaccine. Caller reported the fever had subsided. He took the Tylenol and had not a had a fever, nothing this morning. When he took his temperature it was below normal it was 97 something like that. Caller reports he still feels lack of energy and achy but, he had no fever. Yesterday he had a long, deep sleep and he was sleeping a lot yesterday and all afternoon. He got up for 2 hours and went back to bed around 9 last night and slept around to around 8-8.30 this morning. He slept later than normal, he usually gets up at 7. Caller reported the lack of energy, weakness and achiness was still ongoing. Caller reported his breathing issues started yesterday afternoon or actually maybe 3 or 4 days ago he noticed coughing. Some coughing, not a dry cough, like a smokers cough with chogginess. He stated that he had issues lung and heart problems sometimes and has had that before. Caller reported he was not a smoker anymore, not for well over 10 years, probably close to 15 years. The coughing and hacking up mucus happened then, now this happened starting yesterday in the afternoon toward the evening. Caller usually only uses his oxygen machine at night because that was the only time he needs it, at night. He had some kind of sleep apnea issue and he can't take the forced air, it gives him worse lung problems, so he just uses the oxygen and that did really good. He used it during the day when he was sleeping and all night. He reported he was not on it right now and feels okay breathing. He had felt difficulty breathing before, its something he was semi used to. He knows when to know if there was a problem or not, because he has had the congestive heart failure, and he has had his lungs filled with up fluid before. He knew he was alright, it was just coughing. Caller reports the oxygen was prescribed at night. He can use it any time he thinks he needs it. It was used mainly at night because he could not handle the CPAP machine because his lungs and body could not handle the forced air being shoved into his lungs, which was making him have more breathing problems when he was off the machine. He just had the oxygen on at night and it keeps him okay. Caller reports he took Tylenol and it seemed to kick the fever down but, he was still achy. On an unspecified date, the patient underwent lab tests and procedures which included pyrexia: it rose up to 100.1 degrees Fahrenheit at the highest reading; the lowest reading 99.1 and below normal it was 97. Caller stated that he took lots of medications, and asks could this be a medication interaction, even thought it was been a month after vaccine or was he just sick. Reporter seriousness for events was unspecified. Outcome of the events was unknown.   No follow-up attempts are needed; information about lot/batch number cannot be obtained.