I can eat pretty much anything I want also. When flaring, fresh veggies can be a little rough though, but when not flaring, anything goes. I was also put on the exact same meds as you when first diagnosed 26 years ago. The pred should help pretty quickly, but it's not something you want to be on long term. I have also had good results with the rectal meds (along with the sulfasalazine) I know they sound gross, but they work. What dose of Sulfasalazine are you on?
Were you also prescribed Folic Acid??
You will really find this forum to be a great help. Welcome.....