coughing up blood at gym

So last thursday I was working out at my gym. I usually do 2x a day. Cardio and weight training. I fell in love with it. I was doing leg lifts and I noticed a wheeze that was really watery. I knew what was coming because it happened 4 years ago. Blood! I coughed it out and it was all over my hand. (I hope nobody saw) but I nonchalantly walked to bathroom trying not to panic. It went on for about 5 minutes and I left, I continued to go to the e.r to just get checked out. Everything was fine. Doctor started an extension on bactrim (which I was already taking), then 60mg prednisone, azithomyocin, vit k, etc haven't coughed up blood since. Im just wondering why it happened. It was so out of the blue. Its so discouraging when you do everything right, working hard and then that happens! I gained10 lbs from the protein i have been taking, also my numbers vary fev1s are : 78-76% fvc25-75 : 57-49% Did I over work myself? Did my pre workout cause it? Any advice or words of wisdom! Headed back for the gym today..first time back.
Source: Cystic Fibrosis Exercise and Fitness Forum - Category: Respiratory Medicine Authors: Tags: Exercise & Fitness Source Type: forums