I've been there too Angela. It is very frustrating. We just KNOW something else is wrong, but I've come to accept that anxiety is a disorder with physical manifestations. I know it doesn't help much to know that, but I have my regular check-ups, regular bp tests, ekg=s echo's... I have even gone into the doc's and insisted on a b/p check and a listen to my heart when I've been really bad. I hate to say it's "just" anxiety... because anxiety is one of the worst illnesses I've ever experienced! Still, that's what the doc is likely to say... I try to be thankful that it's not something more serious (physically) that would require surgery, etc. At least my doc knows what to look for, and so far I'm ok even though I don't feel like I am.
It's a jungle out there.....
Theme song from "Monk" by Randy Newman