Summary: Symptoms due to adverse event began as chest pain originally, then developed later into coughing, tight chest, increased chest pain severity while lying down, pounding heart, swelling of abdomen, arrhythmia and shortness of breath. All symptoms except chest pain, arrhythmia and pounding heart resolved but patient continues to have these symptoms at time of writing this report.  Received the third shot (booster) of Pfizer on 4/13/2022. Went on a run 3 days later (4/16/2022) and began to experience severe and crippling chest pain. Stopped running but pain continued throughout the day. By next day 4/17/2022, went on another run and experienced same symptoms but worse in severity. Pain continued throughout the day and visited urgent care facility by the end of the day (4/17/2022). The pain persisted so patient self admitted to Hospital ER at 00:40 on 4/18/2022. ER staff administered anti-inflammatory medication which relieved pain temporarily. Patient was discharged without diagnosis other than nonspecific chest pain. Pain persisted consistently for 9 days until patient self admitted to the ER again for the same symptoms on 4/27/2022. The 4/27/2022 ER visit is where patient was diagnosed with pericarditis. Patient was released from  the ER with a Naproxen prescription. Naproxen relieved pain but after 3 days, patient experienced severe internal bleeding in small intestine, large intestine and stomach. Vomited blood and had bloody diarrhea. Patient stopped the medication and was prescribed colchicine instead on 5/3/2022 by PCP. Patient was cleared by medical staff to travel. For one month, chest pain persisted continuously and peaked after brief moments of physical strain due to general travel along with coughing, tight chest, increased chest pain severity while lying down, pounding heart, swlling of abdomen, and shortness of breath. From now on, these will simply be referred to as "cardiovascular symptoms" since all or most symptoms continued up to the time of writing. On 6/5/2022 patient experienced abnormal chest pain (More than the regular pain experienced up to this point) along with severe leg pain. The patient contacted emergency services that performed and EKG and administered morphine for the pain. The patient was delivered to the hospital by emergency services where he underwent tests to determine cause of symptoms. This yielded a diagnosis of muscle cramping coupled with pericarditis that mimicked symptoms similar to a pulmonary embolism. The patient returned back from trip and two days after arrival, was self administered to the Hospital ER on 6/13/2022 due to an unknown, viral infection that was not COVID related. The cardiovascular symptoms peaked in severity during this visit, then decreased over the course of a week but still remained. The main symptoms, chest pain and arrhythmias continued for two more weeks until patient developed new symptoms:  fever, nausea, severe coughing, congestion, severe chest pain and palpitations. Patient went to local, COVID testing facility and received a positive result. Patient then self admitted to the Medical Center on 6/28/2022  at the recommendation of cardiology nurse. Patient began taking Aspirin dosage of ~1600 mg per day.  Patient spent 10 days in isolation and all symptoms except the pericarditis related ones resolved. Pericarditis symptoms continue to persist to the time of this report. Pain severity has decreased substantially, but arrhythmia and pounding heart continue with same prevalence. Patient was on a colchicine treatment of 0.125 mg, twice daily since 5/3/2022, but ran out of medication on 10/1/2022. A cardiologist re-prescribed a new prescription for the same dosage for 3 more months along with cardiac MRI study. Cardiac MRI study was conducted on 11/17/2022 along with a cardiologist review. Results of the study looked normal. Patient will continue the colchicine treatment but wane off the daily Aspirin by 325 mg per week. Cardiologist  prescribed Metoprolol for patient to self administer when needed for continued arrhythmias.