Hmmm, this is interesting because I am having a very similar issue. My Crohn's seems to be doing better but my appetite and maintaining my weight isn't going well. Everyone thinks my Crohn's isn't under control because I keep losing weight, but it is more I just don't eat enough because like you everything tastes yucky.
I will think something sounds good for dinner and same as you I have two or three bites and the chewing and texture and taste becomes unbearable or something and I don't want to swallow it.
Sorry I don't have any insight as to the problem but find it interesting that our issue sounds the same.
Diagnosed with Crohn's in 1998, father has UC we were both diagnosed at 20 yrs old.
Previously on Remicade, Humira - No surgeries so far
Meds ~ Sulfasalazine 2/2xday, Wellbutrin, Moducare
Supps ~ Culturellle, psylium seed, folic acid, magnesium, D3, K2, Calcium/Boron, multi-mineral.