HEART FLUTTERING; HOT FLASH; PROFUSELY SWEATING; LETHARGIC; SPEAKING SLOWER THAN USUAL AND NOT IN COMPLETE SENTENCES; SHAKINESS; BODY ACHES; WEIRD, INDESCRIBABLE TASTE IN HIS MOUTH; HEAVY AND LABORED BREATHING; FLUSHED FACE; SLIGHTLY SWOLLEN TONGUE; INJECTION SITE ARM WAS WARM TO TOUCH; LEFT ARM PAIN; SEVERE CHILLS; SEVERE JOINT PAIN; EAR RINGING; HIGH FEVER; TINGLING SENSATION IN BOTH LEGS AND ARMS WHILE SITTING UPRIGHT; INJECTION SITE ARM WAS EXTREMELY TENDER; SEVERE HEADACHE; NUMBNESS IN BOTH LEG AND ARM ON SITTING; BECAME EXHAUSTED AGAIN; This spontaneous report received from a patient concerned a 32-year-old white male of unknown ethnicity. The patient's height, and weight were not reported. The patient's past medical history included: covid-19 infection, and concurrent conditions included: alcohol use, and non-smoker, conditions included: The patient had no known drug allergy and no drug abuse or illicit drug use. The patient received covid-19 vaccine (suspension for injection, route of admin not reported, batch number: 201A21A, expiry: 21-SEP-2021) dose was not reported, 1 total administered on 08-SEP-2021 on left arm for prophylactic vaccination. No concomitant medications were reported. On 08-SEP-2021, in afternoon patient began to experience a severe headache, shortly after headache he had severe chills (felt like freezing in winter with no clothes on). Within 20 minutes of chills, he had a hot flash and began to profusely sweat. By 14:00 patient had a high fever at 102.6 Fahrenheit (F). Patient felt that his heart was fluttering. He went to the clinic, and he had a high heart rate with no beats per minute number. The healthcare professional at the base sent him home to rest. Patient wished to be seen by a healthcare professional due to these unforeseen side effects, because the fever should not have been that high. At approximately 15:30 to 16:00 was soaking in pool bath in Epsom salt. He was lethargic, speaking slower than usual and not in complete sentences. The nurse recommended him not go to urgent care and continue home therapy with over the counter Motrin for fever. At 16:30 he was lethargic, had heavy and labored breathing (respiration rate 12), face was flushed even though he washed with cool water. Patient vital signs were taken body temperature was still 102.6 Fahrenheit (F) although he was soaking in the pool bath for an hour. Heart rate was 118 beats per minute, blood pressure was 128/62 mmHg. This was all while patient was sitting and resting on the chair, with no exertion. Given 400mg of Motrin at 17:15. At 18:00, patient complained of ear's ringing for the past 2 hours, which may have started at 16:00. Only reported of ear ringing, because the ringing was unbearable. An hour after taking Motrin, body temperature was 101.4 Fahrenheit (F) and heart rate was 84 beats per minute. headache was still persistent, but felt like it was moving from one area to another. Patient stated that headache was painful by the frontal lobe area of his head. Complained of shakiness. He took a nap. At about 19:00, he woke up and ate a few snacks, then became exhausted again and fell asleep. Body temperature was 98.9 Fahrenheit (F) and heart rate 82 beats per minute. Temperature was decreasing, but heart rate was not normal at about 60 beats per minute. Patient complained that headache was still constant and now had left arm pain, body aches and severe joint pain in his entire body. He experienced a weird, indescribable taste in his mouth. His tongue was slightly swollen, but was not affecting his swallowing very much. Injection site on left arm was extremely tender and warm to touch. Nurse advised that him to seek treatment as soon as possible within 24 hours. Patient was not sure if he wanted to go to emergency room. At 22:00, patient woke up and ate a bit of homemade chicken and rice soup. He fell back to sleep after that. At 22:40, he was still complaining of headache and joint pain throughout body, and pain at injection site was a 5 out of 10. Sensation of tingling in both legs and arm started, while sitting upright. Tingling went away when he laid flat on his back and when he stood up, with mild improvement from the tingling sensation. Every time he sat, the sensation in both his legs and arms would go numb again. Body temperature was 97.4 Fahrenheit (F) and heart rate was 69 beats per minute. Patient went to bed for the night and at 2 AM. Vital signs were checked again. Body temperature dropped to 96.3 Fahrenheit (F) and heart rate was 74 beats per minute. Patient went back to sleep and woke up at 6:00 AM, body temperature was at 96.1 Fahrenheit (F) and heart rate was 65 beats per minute. Left arm pain decreased to a 4 out of 10. Patient went again to medical clinic at 9:30 AM on 10-SEP-2021. Patient looked fine that morning. The action taken with covid-19 vaccine was not applicable. The patient recovered from heart fluttering, hot flash, profusely sweating, lethargic, speaking slower than usual and not in complete sentences, shakiness, body aches, weird, indescribable taste in his mouth, heavy and labored breathing, flushed face, slightly swollen tongue, severe chills, severe joint pain, ear ringing, high fever, and tingling sensation in both legs and arms while sitting upright on 10-SEP-2021, recovered with sequelae from severe headache on 10-SEP-2021, was recovering from injection site arm was extremely tender, and left arm pain, and the outcome of injection site arm was warm to touch, numbness in both leg and arm on sitting and became exhausted again was not reported. This report was serious (Other Medically Important Condition).; Sender's Comments: V0: 20210925879-COVID-19 VACCINE-Heart fluttering. This event(s) is considered unassessable. The event(s) has a compatible/suggestive temporal relationship, is unlabeled, and has unknown scientific plausibility. There is no information on any other factors potentially associated with the event(s).