Sorry you're having to deal with this. I don't have cardiomyopathy, but had my share of cardiac issues a few years ago. It can be unsettling, to be sure, and I know that cardiomyopathy is not something that just goes away. But, it is treatable and I hope you tolerate the medications. I take a beta blocker for tachycardia and have no issues with it. Presumably you are being followed by a cardiologist.
Good luck!
Jan