For the past few weeks, I haven’t been able to run 5 miles without feeling like I’m going to die. I get a mile or two into the run and I feel okay, but then I hit a wall and it feels like my bronchioles and bronchi constrict so no oxygen can get in. I start wheezing and the end of the run is very exhausting/painful. No, it is not anemia because I had that two years ago and still take iron supplements to this day (and I recently got my blood checked and my levels were fine). I just really want an answer right now and this is very frustrating. I’ll be a sophomore in college next year and really want to make my team’s top 7, but if I continue to feel like this, no way that will happen. For some background, my PR in the mile is 4:17 (senior year in high school) and I could only run 4:06 in the 1500 this spring (haven’t really felt myself since that 4:17 last june). Any ideas on what could be wrong with me?
Also, I have not changed my diet, sleeping patterns, or anything like that in the past year.