Hi again, Terriann. No, I have not tried Diamox. I go in for autonomic testing in a couple of months and will try to talk these things over with my neurologist then. Or maybe email him through the clinic. These tests are backlogged as it’s the only place in San Diego that does them. You mentioned you tried Zyrtec again and responded better…no racing heart this time? I really don’t want to chance it again. It was a horrible experience, but the food poisoning didn’t help either. Had another less than stellar meal at my nephew’s house on Christmas (different place) and have vowed to myself I will always bring my own food from now on whenever invited to a friend’s house. There is no way anyone can know what this is like. And for me it’s all “new”, relatively speaking. I am hoping I’ll be able to keep working; time will tell. God be with you. Hang in there!