I think while it seems frequent that doctors quickly brush things off as "anxiety" too soon; sometimes it is indeed the cause of problems. The mind is so closely connected to the body. I don't think anxiety is always the right term though; perhaps there should be a seperate name for severe stress-induced physical symptoms...
Either way, it may not be anxiety in your case, but i've been dealing with a feeling of chest pounding - pretty much constant for months now. Initially I was worried it was something wrong but went through like seriously every major test you could possibly have - from ecgs to mris to holter monitors, stress echos, tilt-table tests - you name it.. Tried topral xl and that didn't help.
I've noticed that it does let down sometimes when i'm more relaxed, and the occasional tranquilizer klonopin has reduced the intensity. I'm also in psychotherapy now, I don't believe it's good to be on a long term drug for anxiety if at all avoidable.
A couple days ago I started getting a pounding sensation in my head and i'm a bit concerned, but I sort of sense it could be purely stress-induced. I can't assume what's causing the problems for others, but it would be worth asking: do you consider yourself an anxious person?