You seem healthy and young enough.
I suppose it could just be overall frequency's excessive (cut back on how many times in the previous couple of weeks, and you may see a return to your usual capability).
The risk is: the more you worry about it, the more the problem will worsen. Work at acceptance, and ease your mind. I think not trying to fix things, is probably the most direct way to get the result you want.
24/150lbs/like 32"?
I dont believe this has started since i stared taking any medication but ive been on two different antibiotics klaricid and augmentin
age / weight / waistline?
Which prescription medications are you taking?