Hey Mr.Poland.. WOW you have described most of my life after I posted that post in 2010..  I am not a PHD but I can tell you our Medicine is not exact science and the body along with the autonomic system(misspelled) can cause all types of problems...   I have had a long 5 years with anexity, semi bi plorar which then cause issues with my training...  Of coarse i am older than you so I may be at a different level of issues..  I think its great you had the Doctors check you out and they do have a HIGH DEGREE of accuracy when detecting issues, but allot of Doctors wont begin to explain physciological issues and all they want to do is prescribed XANA or lexapro etc,etc.....   My issues of heart rate appear to cleared up..  I fought through the hard times but never PUSH IT.. I worked with what I got and never gave up.. However I did have a CLEARANCE to work out by my Doctor..  My Cardio who is like 70 and he said when someone has something serious especially a man who can feel it the majority of the time.. Stress test are far from accurate though they do have a good place..  Anyways feel fre to email me anytime. Don dax0007AThotmailDOTcom