Been icing my neck since about six weeks post injury, pretty much as soon as I read it here. So let me see, that's almost four months of icing.
I never miss a day. I find it somewhat helps ease neck and headache pain if consistent. I rotate two ice packs (with intervals of no ice) throughout my evening.
Sometimes I ice after I wake up because sleeping makes my neck hurt. Can't find that perfect alignment position. Grrrr.
I have received no qualified care to know if my c1 or c2 is inflamed or bulging like many posters talk about here. I don't think my doctors even know as much as the members here know; my care has been grossly ignorant of the realities of PCS. I have no idea what's going on with my neck.
So why I ice? I have neck pain and headaches. The cooling sensation is heavenly and it's relieving, that's all I know.