WOW - Anxiety and Panic out of the blue!

Not doing well recently.  A couple of weeks ago I drank too much caffeine and it triggered an anxiety/panic attack that has gone on ever since for the most part.  Suddenly I'm back in that haze of not feeling myself again that was gone for quite awhile, always feeling full of fear and dread, nervous constantly and wishing I could snap out of it.  Now I'm taking my Xanax three times a day instead of once in the morning which was the usual for such a long time.  And I really don't know why I should be in this mode.....nothing in particular is going on and there have been times when life was full of "issues."  So I guess my counselor of forty years ago was right when he said I had "free-floating anxiety" coming on for no particular reason.  I do know that one of the reasons may be that I can't seem to face my fear of doctors and go and get tests done that, at my age (64), should be a regular thing.  They always say anxiety is caused by some kind of unresolved "conflict" so maybe that's it - feeling like a darn coward but not seemingly able to muster up the courage to walk in the doc's office - or at least feeling that if I do, I will definitely pass out or have a stroke  Anyway, it's just such a burden to feel this way when you can think back (and not so far back either) when you actually felt fine.  And whenever I'm feeling good mentally I'm sure I could never be filled with anxiety again...that I've definitely conquered it and it will never come back - well, surprise, surprise!!