Have been going through exact same thing for 2 yrs and endless test to reveal nothing . Now have me scheduled for the holster test but again last year had the heart scan and lungs scanned and nothing showed . I have a continuous oxygen monitor not only is my oxygen going up and down sometimes for up to 3-4 mins then shoots up instantly . Never had covid or at least no test ever showed covid . No overweight , ear healthy . I do eat sugars but nothing to cause the onset on this out of the blue . All my issue Assyria four month after second covid vaccine . Not saying there is a link but the timing is impeccable . I even have gone as far as to worry it might be microplastics . However getting a doctor to listen when they see a ten second snapshot in the office is sad . Even with all my records of my recording barely made a difference . Been to cardiologist, pulmonologist (no cops) lungs clear . Heart clears no calcified arteries . Even been to endocrinologist, thyroid issues started after vaccine but it’s been in check since seeing Endo however issues with oxygen and heart remain . Seen rheumologist to rule out auto immune such as gravis to lupus . I am at my wits end and feel like just giving up . Walking to my mailbox now causing high heart rate and oxygen drops . I have become dependent on family members to function daily . How did I get here ? I was very active , healthy and outgoing and then this started . It has robbed me of any normal life and left me with no help . Getting genome 🧬 fully scanned which cost a small fortune in hopes on more answers .