The first month post-radiation was just terrible for me and I was very mad that the Docs did not warn me that it would be. After a month things got very gradually better but I could at least tell that things were improving. Milk products created thick phlegm so I avoided them.
I'm now 19 weeks post radiation and the only annoying side effects that I still have are dry mouth, for which my ENT prescribed Pilocarpine, which has just kicked in after taking it a month, and numb soles of my feet from the chemo.