Ive been getting sick multiple times since Saturday, I feel fine until i eat.

You know when you eat to much or to fast you feel like you're full to your throat and your gunna throw up, well I have that feeling with even one bit of ANYTHING and even drinking a sip of something. It doesn't make any sense to me. And if I hold back and don't throw up then I get this heartburn feeling and basically fight the "fullness" feeling until I just give in and throw up. :(

Do you have any ideas as to why this is?