I have recently started to work out and excercise more. Am 24 going on 25 yrs. old and I used to be a bouncer and was 6'4'' and 275 lbs. Out of shape and overweight I decided to change my problem and take better care of my health. I used to smoke a lot of cigarettes and weed but have lessened my cigarette intake but still smoking weed.

I have been active off and on since May '08 off and on average about 2 miles per run. I have managed to control my weight and am down to 220 lbs right now.

I recently started a new workout program for conditioning and have been doing it for about a week now and have had some intense muscle cramps including cramping under my left armpit and upper left chest.

My muscle cramps started to go away a few days ago but this pain hasn't. I thought it could be my heart or left lung; possibly sore muscles around those areas, but I just recently jogged 2 miles an hour ago and was able to complete it but feel weak on my left side with a shortness of breath and it feels like I'm breathing more out of my right side than left. Occasionally throughout the day, the pain eases but hasn't dimenished. Also moderate pain in the sternum like bad indigestion or heart burn.

Is this anything to worry about? Not a big fan of getting surgery done or bad news about health and reading all these topics and replies has me a bit jittery too. Any suggestions?