Having trouble getting a full breath...I think?

I had the same problem a couple of years back. Am male. Used to be very sporty. Like a few glasses of wine etcetera. Got the same as you one Christmas and thought I was a gonner many times over. Doctors couldn't find a thing except a body chemical imbalance. This 'experience' went on for a year or so (at any time of day or night) then lessened (don't drink much now); very rare I experience it now. Listen to your bod; live correctly. Eat properly; rest properly; do steady work; live long and prosper.