quin,
I am not a doctor, but it sounds to me as if your lungs are sort of ballooning. Meaning you are not exhaling enough to make room for more air. When that happens, you have no room left for incoming air. You have to do what is called "Pursed Lip Breathing". What you do is inhale through your nose for a count of 4, or 3, or whatever is comfortable for you. Hold it for a few seconds, then breath out through pursed lips like you were blowing out candles. Your exhale should be twice as long as your inhale. So, if your inhale for a count of 4, then exhale through pursed lips for a count of eight. This will help get rid of Carbon Dioxide left in your lungs. Do it for as long as necessary until you feel as if you can breathe ok. If I am reading and understanding your post correctly, this should work. I am thinking your full abdomen is not because of eating. If I am not understanding your post correctly, then please call your medical provider as soon as possible. Let the forum know how you are doing please. Take care and God Bless!