I would choke on my own fluid, it was blocking my airway; got fluid around your heart; couldn't breathe; coughing phlegm; I could not sleep all night; weak no energy; nothing tasted right; I'm gone, nothing to eat; Could not even walk; Lost 38 pounds; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 77-year-old male patient received BNT162b2 (COMIRNATY), on 15Dec2021 as dose 3 (booster), single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: BNT162b2 (Dose 1, Brand= Pfizer Biontech), administration date: 19Feb2021, for Covid-19 Immunization, reaction(s): "sore arm"; BNT162b2 (Dose 2, Brand= Pfizer Biontech), administration date: 13Mar2021, for Covid-19 Immunization, reaction(s): "sore arm". The following information was reported: GAIT INABILITY (non-serious) with onset 27Dec2021, outcome "unknown", described as "Could not even walk"; INSOMNIA (non-serious) with onset 27Dec2021, outcome "unknown", described as "I could not sleep all night"; CHOKING (medically significant) with onset 27Dec2021, outcome "unknown", described as "I would choke on my own fluid, it was blocking my airway"; EATING DISORDER (non-serious) with onset 27Dec2021, outcome "unknown", described as "I'm gone, nothing to eat"; WEIGHT DECREASED (non-serious) with onset 27Dec2021, outcome "unknown", described as "Lost 38 pounds"; PRODUCTIVE COUGH (non-serious) with onset 27Dec2021, outcome "recovering", described as "coughing phlegm"; DYSPNOEA (non-serious) with onset 27Dec2021, outcome "recovering", described as "couldn't breathe"; PLEURAL EFFUSION (non-serious) with onset 27Dec2021, outcome "unknown", described as "got fluid around your heart"; TASTE DISORDER (non-serious) with onset 27Dec2021, outcome "unknown", described as "nothing tasted right"; ASTHENIA (non-serious) with onset 27Dec2021, outcome "unknown", described as "weak no energy". The events "i would choke on my own fluid, it was blocking my airway", "got fluid around your heart", "couldn't breathe", "coughing phlegm", "i could not sleep all night", "weak no energy", "nothing tasted right", "i'm gone, nothing to eat", "could not even walk" and "lost 38 pounds" required emergency room visit. The patient underwent the following laboratory tests and procedures: Computerised tomogram: (unspecified date) Unknown Results; Echocardiogram: (unspecified date) Unknown Results; Weight: (27Dec2021) Lost 38 pounds. Therapeutic measures were taken as a result of pleural effusion, dyspnoea, productive cough.  Clinical course: He mentioned that with the primary series he just had a sore arm. However, 12 days after receiving the booster, as per patient's verbatim "he lay down to sleep, he couldn't breathe. He couldn't understand what was wrong, he was coughing phlegm and this and that, and he could not understand what was wrong, and when he could not sleep all night because he would choke on his own fluid, it was blocking his airway. He went to the ER. He did not know it, but at that time Omicron variant had come out and it was the 28Dec2021. He had the booster on the 15th."He also stated "After 2 hours he got into a cubicle and was told he would get a CAT Scan, he told them he could not breath when lying down or when seated. Problems he never had in his life." The Dr said to him "you've got fluid around your heart and was prescribed with a diuretic. They injected the diuretic. He filled up 4 urinals in 15 minutes, he was retaining fluid the caller stated. He also stated "They put a nitroglycerin patch on his heart. He started feeling so much better, he could breathe, he quit couching, he could not understand. He was so weak." He mentioned it was hard to brush teeth, too excruciating, he could not breathe, he had no energy. They wanted admitted to the hospital but they did not have enough.  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.