shortness of breath playing sport

About a year ago I came down with glandular fever, but luckily for me I recovered quickly and after 3 weeks was playing sport again. The problem I have now, is that whenever I play sport such as rugby in warm weather, I have a terrible shortness of breath. Using my mums inhaler for her asthma seems to help a little, but the strange thing is that every second night I run 6 kilometers around my block and at the end I sprint the last 300 or so metres without any real fatigue. Yet I only need a couple of short burst of sprinting on the football field to make me stuffed. I was wondering if any one else had any experiences with glandular fever causing them shortness of breath in some situations after recovering from it.

Thankyou,

Spoog

Go to the doctor u need to take meds everyday i got a sickness similar and developed asthma i had to go to the hospital because i kept letting my shortness of breath and weezing go i was in the hospital for a week on like three different steroids that they injected me with and then i had to take an oral steroid called prednisone and then i flipped out oin that shit it was weird but now i take two inhalers every day twice a day so dont let it go. i also played football and it does get better.