Hi there... Everyone here has given great advice. Your hubby has one great so far. - remind him of that! If he is going to continue food by mouth - make it liquid, invest in som nsure, boost, or the like, toss a spoon of protein powder in each bottle if you can, have him take a pain med, and wait until its working (or at least has taken the edge off) then swish with magic mouthwash - and chug his food (liquid nutrition) - then hopefully he can sleep off the meds.
It worked for me during the worst of it...
Good luck - tell him to hang in there!