Shortness of breath. Me what to do!

For the past 1 yr , even after getting medications of anxiety, lung infection , I've been yawning a lot, much more than average (once every few minutes I feel the need). If I'm not yawning I'm breathing in as deep as I can to get similar "satisfaction". Often I cannot get the "satisfaction" from these and so the urge grows and grows, meaning it can get quite uncomfortable. When I do manage it, the urge is back a few seconds later. This is whether I'm tired or not, almost all day.  I'm not particularly anxious about anything in particular, and get the same amount of sleep as before this started.  after getting medications last year ... my problem got better but now again since last few months i m feeling the same and bow i feel little heaviness around my head throughout my day ... and yes i would like to add one important thing which i feel that after working out ..i feel quite energetic but again when i rest afterwards , i get a constant urge to yawn ! so suggest me what to do !