question: 51 year old male, active life style, crossfitter. Annual physical - good, labs all good, colonoscopy clear. Experiencing slight shortness of breathe. No tightness. No asthmatic symptoms. Comes on when relaxing. Able to workout at high intensity without experiencing any shortness or cardio difficulty. Started taking one medication two weeks ago: minocycline 100 mg ,or an acne breakout. I take no other medications. I do take multi vitamin and omega3 capsule, called dermatologist and he said it s not side effect of meds. Any suggestions?