PVCs are very difficult to diagnose. SEveral years ago I had them every second or third beat. Went to 2 Conduction Heart doctors, a regular heart doctor and the ER 5 times. Nothing they suggested work.
I had GERD and changed my diet instead of taking a Proton Pump Inhibitor forever and the PVCs went away. I just eat a blander diet with almost nothing spicy or acidic.
I think I had an inflammation of the vagus nerve but several Doctors would just shake their head when I suggested it.
I don't knowingly have a thyroidproblem.