Why does my doctor think that  my constant irregular heartbeat and slight mitral valve leak need no treatment? Four weeks ago I had a tachycardia brought on by being awake for about 48hrs and drinking soda/energy drinks all day and taking a couple vivarin.  My heart was beating quickly and I thought I was having a heart attack.  I went to the ER and they diagnosed me with a tachycardia and told me to get some rest and that I would be fine.  Well, I got my rest and I did not get better.  It has been 4 weeks now and I have completely cut caffeine and alcohol and most sugar and everything else I can think of out of my diet.  I have had several tests done and the only thing my doctor came up with is a leaky mitral valve which he considers to be slight.  He is not concerned about my irregular heartbeat and isn't concerned that my heart now races by performing everyday activities.  I am only 26 years old and have cholesterol of 120! My good cholesterol is 48! My normal resting heart rate was 58, now it is in the high 70's! I have an appointment with a cardiologist next week. Any opinions or advice?

Summarized question: Is it okay for doctors to not recommend any treatment for constant irregular heartbeat and slight mitral valve leak?