Start out slowly. Eat only low fat for at least a month after surgery. My surgery was about 5 years ago. I made myself sick by eating fats too soon. That is miserable. Make sure you go slow and take your time. Eat base foods that are simple. Veggies and fruits and whole grains. You can add in some fats after about a month, but I wouldn't eat a meal with more than 10 grams of fat. Your best bet is to see your doctor or a dietician to assess your situation. But, be warned, that if you jump into high fat foods too soon, you will regret it.
Now, I can eat pretty much anything, but anything with high fat content goes right through me, so it is not worth it to me.
You will feel normal soon. Just hang in there.