It sounds very much like my exercise-induced asthma. Often the first way I know I'm having problems is that it will take me much longer than it usually does to recover my breath after hard exercise. Be sure you take the time you need to recover before continuing with your workout. Sometimes my trainer will even notice it first, and will make me sit down for a minute or two before she lets me do anything else.
As long as I use my Advair inhaler religiously twice a day I don't have these problems, but I'm bad about "forgetting."
Thyroid forum moderator
Ulcerative colitis; 8th year of remission with Remicade. Inflammatory osteoarthritis; osteonecrosis from steroids. Grave's disease post-RAI and now on Levothyroxine. Type II diabetes induced by steroids.