Your situation and mine are almost identical except I'm not taking anything for it. My symptoms seem to come and go at times and every time I've been to the doctor for it they tell me my heart sounds fine and they ran an EKG on me ( also good), even time I've had my cholesterol checked they say it's in that perfect zone. I've done everything I can think of to get the symptoms to stop ( I've lost some weight, eat mostly healthy foods, try to keep my stress down) nothings working. I'm 38 right now and have been dealing with this since I was in my mid teens, it almost feels like a full on heart attack at times but I'm still here gripping about having the worlds longest heart attack. I hope you can get your symptoms under control.