Welcome to HealingWell, Lantana. I'm so sorry you have UC, but so glad you found us. I'd suggest you refer to the "UC Resources" at the top of the page. Read the postings and follow the links there to get a good general understanding of what UC is and how it works.
The most important thing to realize at this point is that UC is a chronic disease. While it can usually be treated successfully with medication, the only real cure is surgery. At this point I'd say don't even worry about surgery because the majority of us never need to go that far.
Once you've reviewed that, you'll have a better idea what questions you have. Feel free to ask any questions you may have here; we've all been where you are and we understand.
As far as diet, that is very individual. You'll hear a lot of different suggestions here, and what bothers one person doesn't bother others. The best bet is to keep a food diary, writing down what you eat each day and noting what causes you problems. You'll need to watch for patterns, so it takes a couple of months to really understand what you're seeing. Also remember that UC is a disease of flares and remissions; it can be hard to know whether changed symptoms are just a part of the cycle or a result of something you did.
It's important to take your medications all the time, even when you're in remission. Remember this is a chronic disease, and the medication is to help keep it in remission. And yes, it sounds as if you may want to consider seeing a different doctor. Since you will be seeing this doctor at least several times a year from now on (more if you're flaring badly), you'll want to have someone who you can communicate with and who will take time to explain what's going on.
Welcome again to HealingWell, and keep us posted.