Aurora, I'm so sorry that you're going through all this. I too suffered from depression, but with drug and talk therapy managed to get it under control.
I've never has asthma, but our SIL has it and like you has to use at least two puffers to get relief.
This news about your EKG findings could be serious, but probably is a glitch due to the asthma.
Please, don't worry so much about the unknown and speculate that you might not be able to attend your son's wedding in October 2009. That's still a long way away, and much could be corrected by then.
I suggest taking a friend to your cardiology app't. This is important because in your panicky state you may not be able to absorb what the doctor is saying. Also, I suggest asking your friend to make notes for you concerning what the doctor said.
I know it's hard, but really try to take one hour at a time, then one day at a time and focus only on that; after all, everything else is an unknown. When you have more information to work with, it should be easier on you.
Right now, be kind to yourself.