I had the same radiation treatment, finished a month ago. I started the Moo Goo a couple of weeks before treatment, and I also got a tube of lanolin that I used as well.
My skin held up very well, except for a small patch under the collar bone which peeled a bit - probably because I sometimes missed it with the creams. So, feel free to slather on the moisturisers, and go above and below the collar bone.
My doc suggested using the lanolin in the shower as well as using it as a cream.
I was a bit tired, which grew over the weeks, but I was able to drive myself every day. I tried to walk every day, and even had a bike ride sometimes.
Gillian