Welcome to HCM,
After going through your history,due to atrial fibrillation anticoagulant
are given to prevent thromboembolism
for which INR 2 to 3,dose needs to be adjusted depending of PT result.
These dug level have many interaction if you take any other medications.if it is high persistently decrease the dose of anti coagulant. Why potassium supplement it is not clear?
If you want to decrease weight take care of your heart rate as any exercise increases heart rate.
Herbal supplements may also change level of drug which may affect PT( Prothrombin Time
Good Luck to you