Hello @sherryfulk.
Beginning treatment was a terrifying yet exciting time for me, wanting to be rid of this cancer and yet fearful of the side effects. While my cancer was ear, not throat , the scatter radiation caused oral ulcers and the targeted therapy Cetuximab caused other side effects. The oncology staff did a great job of adding in nausea drugs and steroids as I needed them later in treatment. Oral lidocaine gel is something I requested to use prior to attempting eating so that I could tolerate the pain of swallowing. Magic mouthwash was a temporary pain reliever. I did not use a stomach tube but looking back I think it would have been easier to get nutrition in if I had. Make sure that you utilize the experience of the team by keeping them informed of all issues. Don't wait and try to fix it all yourself. They have the solutions.

As to alternative/complementary treatments, the doctors don't know if these could possible interfere with standard treatments as there are no studies. Doing some research yourself can offer some potentially helpful pathways, but perhaps better done post primary treatments. One thing I wish I had known about was Manuka Honey for healing. I would have been using that as a mouthwash diluted, and swallowing it to help healing and fight infection. The question is.......is it also healing to the cancer cells? I haven't seen that answer (no studies). As a veterinarian I would never take Fenbendazole for anything other than a parasitic infection under doctor's orders. Look toward other sources of immune stimulation like Beta Glucan and medicinal mushrooms. Here are a couple of books that I have found very useful:
The Rebel's Apothecary by Jenny Sansouci, and
How Not to be My Patient by Ed Creagan MD, a Mayo palliative care doctor.

During treatment, consuming calories is key, whether they are particularly healthy ones or not. I looked forward to a weekly frozen mocha drink from Panera every trip back from chemo/radiation.....600 calories of fat and sugar but tasted great! There are so many protein drink sources now that you can find something tolerable, even if he has to hold his breath to drink it! We are here to support you by sharing our hints from our experiences. You and your husband are not alone in this battle and you both can get through it. Do you have an extended support system at home? Are there family and friends who can share in caregiving? If so, take them up on their offers. You will need a break to keep yourself healthy. Be strong.