I think most of us who start suffering with anxiety first think it must be something physically based - especially those of us (like me) with health anxiety - always thinking "something" must be wrong with me. But I would assume if you've already gone through those battery of tests that there probably isn't anything physical - that's it's more likely the anxiety/panic monster. My question to you is - why don't you start back on the Lexapro if it helped you so much? Boy, if I could find a med that made me feel totally normal again, I'd be on it forever. Are you going through any particular stresses in your life that could be making anxiety/panic start up? Sometimes it can be something relatively minor that we don't think is that important that can throw us into a tailspin of anxiety - for me it's worrying about
doing a good job at work - I feel like I like what I'm doing and don't mind the stress all that much but then I have these anxiety attacks that make me realize that SOMETHING must be bothering me. You're the only one who can answer that question though - and sometimes it's hard to be honest with yourself when you're trying to cope. Hopefully this site can be a good "therapist" for you - people have some wonderful insights on things - and if nothing else - provide a good "listening" ear.