Had my appendix out, it was terrible. It felt as if all my guts sloshed around for weeks. I would suggest to over rest, but I don't have any actual medical advice. I will add that when I had a tumor removed from my spine I got back out as soon as possible, and really focused on rebuilding all the Muscles in the area. Really helped a lot. But tummy surgery? Phew...
Oh and good luck, stay positive.