Susan, you're getting wonderful advice here, and you've definitely come to the right place. My fellow David pretty much covers all the issues I can think of, most of which I experienced as well.
Please use this forum - and Personal Messages, don't forget those - as a lifeline during your treatment.
I hope they're giving you everything you need for pain, whether in pill or patch form and/or as liquid numbing to help you swallow what if it hasn't happened already will more than likely eventually come to pure liquid nutrition. (you didn't mention whether or not you had a PEG).
We're all in your corner all the way. You'll definitely come through this.
David 2