I had it in high school, but I also got it again, 5 years ago. It was mid fall and I thought I was just having an allergy/asthma flare up, but I didn't feel right. Went to the doc after work and bam, he took one listen to my chest, and sent me down for an x ray. This happened the week after we got back from a long weekend bike tour in Vermont. It was cold in the AM and we did hard climbing; the day before we left, I started sneezing like crazy. That's my sign I am getting something bad.
I ignored it, willed it out of my mind until the trip was over. I was on Cipro for 14 days. I thought I felt better after 2 days at home, but I tried riding after a week and I had to turn back after 5 miles. I was so weak, it wasn't funny. My sinuses got involved and was on another antibiotic for 10days, too. I tried riding again on Veteran's Day and could barely do 15 miles. My riding was over for the season; I did some light hiking and went to the gym until x country ski season began.
My advice is to be careful. My asthma is not exercise induced, and rarely flares up now, but I used an inhaler for awhile after this. Go see a pulmonologist or an allergy specialist.