Jennifer,
Hopefully you'll get responses from some people whose diagnosis was closer to your husband's than mine, but I can identify somewhat with the problems associated with dry mouth and "weird textures". For a LONG time after I finished treatment, eating was a really time-consuming chore but I just kept focusing on the fact that it was a necessary part of survival. There was a lot of trial and error -- experimenting with soft foods that tasted terrible while my taste buds were rebounding from radiation. Eventually, however, all of the taste sensations came back, my salivary function slowly started to come back with the help of medication, and I got back to the point where I could really enjoy eating again. Please try to keep your husband from giving up on the eating attempts -- it won't be easy for awhile, but hopefully he'll continue to heal.
Cathy