Here's my two cents worth.... gut pains usually boil down to rolling gas and my guess is your body is producing quite a bit of it while it is in a flare and unhappy

Minimal sugars (because most if not all of our food we consume will turn to glucose or a sugar in the breakdown process)
Protein (when in doubt grab a piece of protein, most wild game and usually turkey and lamb are safe in the beginning)
Starch (tread easy with this one but White rice or Yellow potato are good beginners as a filler - use an Earthbalance or plant based spread with salt for flavor)
Maybe Coffee...if you have been ok with it just use dairy free creamers or just a little sugar if need be.
Stay hydrated....water, vitamin water (maybe check for fake sugars),
Magnesium and VitD3...be on this band wagon and start slowly. Use liquid mag lotion anywhere on the body (legs, arms, torso etc..) and the VitD at minimum 5000iu when reacting (sometimes I take 10,000iu for a few days and especially when I get a cold and feeling ill, and I also match that with 300-500mg of Magnesium internal/external what ever works).
I don't mention fruits or vegetables right now because your body isn't sure what it's doing at the moment and the budensonide will only keep masking what you are reacting to so people use it to get a handle on things and rebalance how they want to approach this dis-ease. Once they feel settled it is important to really hone in on what foods are helpers and hinderers, and you only know this by not covering the signs up with medicine

I know this is a lot of information.....do what you can and a lot of this is patience not perfection and hang in there
