@sandra1953 Once upon a time I suffered through years of tachycardia like yours. Eventually I found a series of disorders that sounded like your symptoms and mine. I got a lot of help from the Mayo and other clinic videos, and from NIH.gov books, articles, etc. I finally got on metropolol tartrate, which seemed to alleviate it. But Mayo and AlnylamAct.com are helping me. "all blood work except auto immune is normal" Sounds like mine.