Hi, Shortness of breath, sometimes can breathe nicely sometimes I have to take 2 or 3 long breath to complete one and sometimes even it doesn't complete and I feel heaviness on my chest during breathing. I am smoker also. I did blood tests and X ray everything was normal Doctor told me this shortness of breath is because of anxiety and prescribe some medicine and said I'll be fine in 3 or 4 days but nothing happened the problem is still on?