I'm new here too. And, but for the surgery, been through the same.
Still, I got over it! The best thing you can do to distract you from uber
hunger is to put your attention into something else.
Something that gets all of your attention. For me, fast-paced/action videogames (such as Halo) does
wonders for me, I get "in the zone" when I'm playing. I hope you find your
mind consuming activity soon.
(Rubik cube works too!)
And don't worry, you can do it!!