Just a quick note to say hi! Please visit the heart rhythm community also - http://www.medhelp.org/forums/Heart-Rhythm/show/92
Many of us are going through what you are and understand what's going on.
Sounds like you're having some type of arrhythmia, have you gotten a copy of all of your tests? If not just call or send a request for all your records to the doctors you've seen.
Once you know what you're dealing with, sometimes it makes it easier to cope with the problem.