Find a way to cope with the anxiety and get through it. The alternative is to walk away from the test which is not desirable.
Think positive. The thyroid issue is probably the underlying cause so taking the synthroid (or generic) should take care of it. I am on 75 mcg and it has worked great. I once accidentally doubled up and that may have caused a PVC run. The only inconvenience with that is you can't eat for an hour after taking it in the morning. Otherwise, side effects are rare.
Thanks both of you, I guess I'm just super nervous about it coming back positive that something is wrong. I appreciate your kind words.
If your echo was normal the test is very likely just to be totally sure but a clean echo is a very good sign so try to keep it in perspective. Most doctors just are overly cautious. Take care.