I went through almost the same treatment. I received 7 weeks of chemo, with Erbitux, before the radiation started, for 14 weeks total. I got a very bad rash within days of starting the Erbitux. The doctor skipped a week of it and prescribed an antibiotic. I can't say the antibiotic did much, but the rash did settle down after a couple of weeks. I haven't heard of using Head and Shoulders, but certainly would have tried anything.

The morphine also gave me instant constipation. So I didn't really take much during the treatment. I did use something call Magic Mouthwash. It's by prescription and the pharmacy mixes it up. I would gargle with it and my mouth would be numb for an hour or two. This helped with brushing my teeth and swallowing things. I stopped eating after the first couple of weeks of radiation, just using the peg tube, but I continued to drink water for the whole treatment. I was told that liquids can be just as good for the swallowing muscles as food. And after the treatments, I was able to transition back to eating without too much difficulty (other then the taste of things).

I also used the baking soda/salt water gargle quite a bit, especially after my saliva started to thicken up. It was actually very refreshing and helped to clear my throat. I found it tasted better with sea salt.

I also used Aquaphor for the radiation burns on my neck. I still ended up with a lot of scabbing, but looking back, I probably did not use enough or put it on frequently. I probably just wanted to be left alone, not always the best thing.

I hope any of this helps. Good luck.