That could be good news, in a time of bad news. I believe thyroids can cause heart problems, and are responsive to drugs...not sure that's what you've been told, but sounds like a possibility.
Doctor called. Seems there is an infection going on and other tests pointing to possible thyroid problems...time will tell
I think the valve problem is causing your chest and neck going on. Low blood pressure can cause dizziness.
Has your doctor recommended a schedule for repairing your valves?
I had my mitral valve repaired in 2007. It is a serious operation, but one that must be undertaken in some cases.