Sorry you are feeling anxious about the radio. I know everyone says it is the easier part of the process but it is still the unknown part of how your skin will handle it etc. I actually found the pain in deeper quite severe at times and found it worrying because not much is said about this. All the info seems to concentrate on the skin reaction. I kept asking the onc about my pain and she kept reassuring me this was 'normal'. I still have quite a bit of discomfit when I stretch the arm and chest area (2 months after finishing) and was told this may take months or even years to totally resolve. Some people always have a little bit of pain left in the area (hopefully not us!)
With your skin, you could try using pure aloe vera gel immediately after (or within the first hour at least). This has a cooling, soothing effect. Another idea I read on here is to put a wet washer in the fridge and put this onto the area as soon as you get home. Moo goo is excellent but particularly if your skin is fair you may find you still get quite a reaction. I have olive skin which held up very well during the 5 weeks of radio but I did find it got worse for 2-3 weeks afterwards. I had some skin peel which was very uncomfortable but the skin underneath was very healthy thank goodness and I did not have any infection issues. The area now is just a tanned look.
Hope you find some relief and that it goes as well as possible for you. Take care. Deanne xxx