Hi i am a male 5'10 185 lbs. and exercise regularly. I smoked weed for fifteen years but pretty muched stopped since sept. of 2010. I have smoked since maybe once a week but will not anymore. Anyway i have been having these chest pains that lasts for seconds and come and go only when i am relaxing like watching t.v. oron the computer for five months now..When i go to the gym and run and lift weights i feel great, like really great. But when i am at home or say at the grocery store i get these chest pains that hurt real bad. It feels like a horse kicks me in the chest or sometimes like a real bad burning feeling. It is located on my left side on the center and sometimes under my left arm on my chest. It does not spread through my whole chest. Had numerous Ekg's done, blood work, chest x-rays and a treadmill stress test. All came back (-) except an rbbb during my stress test. Dr. said not to worry that i did excellent on my stress test. What can this be? It only lasts for seconds and comes and goes. Some days i do not get it at all. Other days i feel like it is waiting to happen during the day and it will happen a few times. I go back for a holter moniter in a few days and then an echo the next day. Is this something serious ? Why do i feel so good when i work out and exercise? I did have a lot of stress last year but this happens when i do not even stress about anything. Please Help? I only stress when i get these pains also. Thanks.