Welcome, though sorry you have to be here. As you can see from my signature below, I was also BOT. I'm now 14 months out from the end of treatment and doing well.
You are at one of the best facilities in the country, so you can certainly feel good about that. What have your doctors said about surgery -- either for the primary or the neck?
Eat lots and lots before Tuesday. Get used to drinking lots of water. Be religious about rinsing your mouth with salt water/baking soda mixture. Get an Rx for "magic mouthwash" (your docs know what that is), and follow your doctors' orders precisely. Everyone's experience during treatment is slightly different. Whatever your experience is, it is doable, and it is finite. Be determined and just get through one day at a time. Pretty easy at the beginning, not so much at the end.
Stay close to the OCF site, as there is lots of good advice and support to be had here. Best wishes!!