sprout,
Welcome to the forum.
Sorry for your recent diagnoses.
I would suggest you look into PALEO diet - that would be friendly to both UC and diabetes.
It is an anti-inflammatory diet, which is made up of lots of grass-fed animal products, fish, veggies, and some fruit - generally NO GRAINS.
Also, you'll have to be careful not to take any steroids - which as you may know may make your diabetes much worse.
There are lots of things you can do, if you are interested, I'll be glad to give you my listing.
Good luck, I'm sure it's all overwhelming right now, and I am sorry about that.