I have been exercising 3-5 times a wk for 3 yrs (treadmill walk/jog w/free weights). I am 29 yrs, 5'7", 128 lbs & I don't smoke.
During the first year I was exercising, I could jog for 1 mile (never any more). Then, my endurance started decreasing. I could jog for 5-7 minutes, walk, jog again. Then, my jog endurance came down to 3-5 minutes at a time. Currently, I can jog for no more than 3 minutes before I have to slow down (feel like I'm hyperventilating).
About a year ago, I started getting a pain in the right side of my chest (feels like a side stitch in my chest) that radiated up to my shoulder and neck when I pushed myself extra hard (example: walk 5 min., jog 5 min, walk 3 min, jog 3 min -- in the next jog session, usually after about 8 minutes of total jog time, the pain would start). When I stop jogging, the pain stops. I was checking my heart rate manually, and I bought a heart rate monitor, and my heart rate increases to 150-160 bpm with walking alone, and increases into the 185-200 range when at a slow jog.
This morning, I had the chest pain again (after the usual 8-10 total min of jog time, run 2, walk 2, run 2...etc...), took my bpm and it was over 200. My strength and endurance are coninuing to decrease. After I excercise, I feel like I can't take a breath without coughing. I start to cough sometimes if I take too deep a breath.
I recently had an exercise stress test, EKG, chest x-ray, spirometry, and echo done, and the results all came back normal. I feel like I can't get an answer as to what is wrong with me. HELP, PLEASE!