did you know something as simple as low potassium can cause this...i know because i am going through this right now. It can cause heart flutter, hip/groin pain,foot pain , back pain, leg pain , feeling off, etc......and i am only mildly low....my dr tested my electrolytes and it was 3.2 and he told me to start eating potassium foods so i started drinking low sodium v8, coconut water, baked potatoes, bananas, canteloupe, etc all things with high potassium and slowly it is getting better.....i also started taking slow mag avail at walmart as well and d3. what can cause this...elevated b12, or avoiding foods with potassium because of high carbs , too high d3, taking sulfur things like msm, etc....