Campy is foodborne so you have to be careful like always with raw chicken and other raw meats and foods. It's reportable to public health in my state.
It's not fun but very curable so that's the good news.
Ya, I would think that fewer of the bacteria could cause problems in a person with UC compared to someone with a normal gut.
The absence of D is a bit different. Hang in there and soon you'll have one less thing to deal with. How did they find it?