My surgeon allows me to take chewable Gas X and it really helped the first few days. Walking around and sitting up straight helps a lot too.
I'm 8 days post op and feeling better already...hang in there, each day gets better!
Find something to do, even come read posts here each time you have that mental hunger, that subsides quickly too. I think we are so used to eating, it's just habit...at least it is for me! - well WAS for me!