I was in a similar position 8 years ago when going into the Military and flying at the same time. To be honest I Didn't realise asthma was a major hurdle it just didn't occur to me it would be a problem. To be told i couldn't join and had to stop flying at about the same time was devastating but now i hold a full CAA class 1 medical flight crew licence (no restrictions) and am applying to NATS as an ATCO so there ARE ways around it sometimes you just have to be very patient!