Dawg, are you taking a CoEnzyme Q10 supplement along with the statin drug that you take? Statins deplete CoQ10 from the body, and proper heart function is dependent upon having enough CoQ10. I don't know if this could be part of your problem, but it's something to consider (disclaimer: I am not a doctor, but I also know (from experience) that some doctors overlook things like this when prescribing meds).
Also, statin drugs themselves have all sorts of side effects, as we've discussed before in this forum. I know you have been taking a statin for 12 years without any serious problems, but sometimes an intolerance to a drug can develop over time. Here is one article about some of the potential problems with taking statin drugs:
https://www.westonaprice.org/health...about-popular-cholesterol-lowering-medicines/