Ashley, as everyone has said, we're all different. I can't speak to chemo but only radiation.

I personally found it very debilitating after about 3 weeks. If you can get someone to go with you I'd recommend it, especially in the latter weeks. Radiation itself, as the others have indicated, is not painful itself. It feels like nothing in fact. There's a lot I could say here... but I won't elaborate further until you know your definite course of treatment.

I found it helpful to listen to music (and later on a book) while going through it. They wouldn't let me use earbuds so I borrowed some small speakers and literally balanced them on my chest. The mask can be confining (although you get used to it), so having a distraction is a good idea.

Keep posting questions as you go along. You'll get the best advice possible here from your new friends.

Courage!
David 2