Nathan, sorry to read your news but you'll definitely get through this, you have the right attitude! I second and third what David recommends. Like him I didn't go with a PEG - it was tough, but doable (although I don't necessarily recommend it!). If you do decide to forego it, make sure you have plenty of viscous lidocaine or other numbing agent on hand to help you get the necessary nutrients and water down.
No question, you're headed for a rough time. But then it'll be over and you'll be relieved and proud that you made it through.
My one piece of original advice: baby yourself during treatment and for a good few months afterward. Don't plan on doing much and don't feel guilty or stressed about not getting anything else in your life accomplished. Easy to say, I know... but you will really need to devote 100% of your physical and mental self to getting well.
That said, we all are as David said available at all times for anything you need.
Courage!
David 2