I'd agree with tlkiwi, sounds a lot like exercise induced asthma. I have it and when it hits, that feeling of constriction (like slow suffocation) just SUCKS!!! I have meds I use now before physical activity so I haven't had an episode in a long time. Best bet is to write down the sequence of your symptoms while they're fresh in your mind and get to your doc. Asthma sucks but not participating in your favorite activities sucks more.