I had mine out last fall, middle of October. The first several days were really painful, I have a high tolerance to pain killers. My main problem was that I get severe muscle spasms in my stomach area whenever I have a major injury, or a surgery there. I just had a kidney surgery last month and the same thing happened. So the muscles spasms put me back in the ER, made the pain about 10 times worse. As soon as they got those stopped it wasn't too bad. After about 10 days the pain level really dropped and wasn't bad. It was still sore for a couple weeks though. Are you getting it lathroscopically (spelling?) removed?
As for diet, I can't eat really high fat without getting nauseated and sick feeling the next morning. Dairy fat seems to be the worst. It's not a huge problem, I just watch what I eat and if I want to eat something higher fat I just have a small portion. They gave me vicodin, which doesn't help me much but worked better than nothing. The worst is throwing up after a surgery like that (not fun!!), so be careful with the meds. Don't take a big dose at once if you don't know how you handle that med. And don't take them on an empty stomach. Start out with the lower dose and after a couple hours take more if you need it.
It was worth it, before the surgery I had really severe pain in my side, constantly sick and nauseated, and riding would make it worse. Just start back on a regular diet slowly, and watch what you eat until you know how you'll react to it. You should feel much better than you're feeling now. A couple weeks and you should be pretty normal again.