Many viruses we all have had throughout our lives gives COVID the upper advantage. You first have to eliminate and system in the body for the symptoms you experiencing to eliminate a true malfunction like chest pain and the heart. If you do not have a treatable symptom. Then the roads most likely lead to the brain.. Longhaulers can not be fixed by a primary care after 6months. Longhaulers is complex and going to Mayo and meeting Dr Munipalli changed my life and the outcomes for me. Dr. Sletten and his team will help with true symptom relief. Good Luck.