You are in a difficult situation because you have a combination of things to deal with, and because you are allergic to things which would otherwise be beneficial.
It is difficult to know what to suggest, as you may have a bad reaction to anything which is suggested.
Think about all of the things you have used in the past. Try to determine which have been the most beneficial. Use those to promote some improvement in your condition.
Have you tried astringent bitter tonic herbs such as Agrimony or Golden seal, for the digestive system? They will also promote flushing of the liver.
Are you familiar with mucilaginous herbs such as Marshmallow, or Psyllium for intestinal ulcers?
When you try anything new, I suggest trying one thing at a time, so you can determine if it is beneficial. If you try a number of things at once, you won't know which one is beneficial, or had a bad effect.