Were you given any liquid pain meds such as Lortab? If so, please take it. There are no big gold
stars given out for how much pain you can take.
You might be dealing with the hunger pangs from the isolated remnant stomach; you may only have a 2 oz pouch, but the rest of your stomach is still expecting to be filled up! It may take a week or more for the stomach to stop demanding food. In the meantime, stay hydrated, and maybe do some protein drinks and s/f popsicles.
In the meantime, walkwalkwalk, sipsipsip, take your meds, nap as needed.
You'll soon feel better, but if it gets too rough do call your surgeon's office.