Almost fainting 3 minutes/Almost fainted/Really close to blacking out; Almost passed out; Nauseated/Swirling strong nausea through the body up to the chest; Rapid heart rate; Hyperventilation; Labored breathing; 5-10 minutes before able to uncramp his hands; Waves of the feelings came throughout the day; This is spontaneous report received from a contactable consumer (patient). A 46-year-old male patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Batch/Lot number: ER8733), via an unspecified route of administration, administered in Arm Left on 15Apr2021 11:00 as single dose for covid-19 immunization. Medical history included sensitivities to ephedrine from an unknown date and unknown if ongoing. The patient had no concomitant medications. The patient experienced almost fainting 3 minutes/almost fainted/really close to blacking out, nauseated/swirling strong nausea through the body up to the chest, rapid heart rate, hyperventilation, labored breathing, 5-10 minutes before able to uncramp his hands, waves of the feelings came throughout the day, almost passed out/ really close to blacking out; all on 15Apr2021. The events were not required a visit to emergency room, nor physician office. Caller is a 47 years old patient who received the 1st dose of the Pfizer Covid vaccine on 15Apr2021. He complained of feeling nauseated, and rapid heart rate, with hyperventilation, and almost fainting 3 minutes after the 1st dose of the Pfizer Covid vaccine. This lasted approximately 15 minutes. 3 minutes after receiving a vaccine. He started to complaint about feeling nauseated. He started rapid heart rate which caused him to have hyperventilation and almost fainted. The episode last for 15 minutes and he just want to go and report it. Consumer confirmed it was the Pfizer Covid19 vaccine. The consumer wasn't still experiencing the side effects. They lasted to 5pm. I got my shot at 11am. The event was no longer persisting but he was wanting to understand the effect of the second shot, the consumer wasn't took any treatment for adverse event. Caller states that he is calling about the Covid Vaccine. Says with the first round of the vaccine he had an adverse event. He is looking to Pfizer and his doctor for some feedback to understand whether or not he should get the second dose. Says that about three minutes after the vaccine he felt a swirling, strong nausea throughout his body up to his chest. He had labored breathing and a really fast uncontrolled heart rate for about 5 minutes. States he was hyperventilating and almost passed out. He had to sit on the ground of the parking garage where he had gotten his vaccine. About 5-10 minutes later he was finally able to uncramp his hands. States that before the vaccine he was calm and not at all in an elevated state. States he is wondering about the second dose being stronger. He almost blacked out after the first dose. States it was close to the limit of what he could tolerate. States he needs further details. He was reading about clinical trials and some doctors. States that he did not have all the symptoms of anaphylaxis that they described. Says his symptoms lasted about 5 minutes or so. About 10-15 minutes later he was recovered. Says waves of these feelings came over him throughout the day. Says they decreased each time and ended that evening around 1700. Caller says he did not go to the Emergency Room when it happened. The nurses at the vaccination site attended him.  At the end of the call the caller mentions that he has a sensitivities to ephedrine. States he does not take any Sudafed or Dayquil or anything like that. States he didn't know if that was relevant to mention or if anything like that is in the vaccine to make him have the response that he did. History of all previous immunizations with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available) was none.  No prior Vaccinations (within 4 weeks). No family medical history relevant to events. No Relevant Tests. The outcome of events was resolved on 15Apr2021.