I am 20 years old. I feel shortness of breath from last 10-12 days, I feel like I am not talking deep satisfying breath also yawning 1-2 times in a minute. I showed to a physician 10 days ago and he gave me montair lc and ab phylline sr 200 mg for 15 days, also he does complete body checkup. The report came normal also my chest is clear, no cough or cold nor I am smoking. But after 10 days also when I concentrate on my breath I feel uneasy and my focus is always on my breath and that feel me anxious. Please suggest what I do.