I'm sorry this has been such a difficult and frustrating endeavor for you. In my experience, leaving messages at doctors offices never gets anything done. We can assume its one persons fault or another's fault, but that's not really what is important. When I want Rx refilled I usually go to the docs office and talk to the lady at the front desk. Or I call in until I actually get a person (just some general advice... I'm not saying that it's right that you have to do that, but that's how it is).

I wouldn't try to diagnose yourself - that will just aggravate you more. There are more tests that your doctor can perform (cardiac catheterization, xray, etc.).

Sadly, while doctors know a lot, they only know as much as what we have researched and discovered about the human body (which is surprisingly very little with everything that we know). If you are really concerned, you may want to see another cardiologist to see if they can get you a quicker diagnosis or a second opinion. Some types of heart disease are benign and require only monitoring as an intervention and others require things like pace makers and medications. You can't know until you get that diagnosis.

It's difficult because the heart is such a vital piece to our health and well being. Heart problems, however minor or suspect, can cause a lot of stress and the amount of work needed to pinpoint the problem only adds to it. It would be perfectly reasonable for you to ask your doctor for some local resources for people in similar situations.

You are in my thoughts and prayers. Keep advocating for yourself.