What I did at the time ... curl up on the floor and cry a lot (gently). And consider quitting. But then I kept on going. However, my situation wasn't as serious as yours. I probably could have stopped, since we got the whole thing surgically anyway. You had lymph node spread ... that's a lot scarier.

Are you on painkillers? That may seem obvious but ... my doctors didn't actually give me any painkillers till I broke down completely in their office towards the latter end of treatment. And no one told me I could ask. I didn't TAKE anything at home, because I had the stupid feeding tube and wasn't sure what could go in it. So ... it got pretty bad. So if you aren't already on strong painkillers and on a treatment regimen for your neck (I'm guessing that's where your burn is?) ... please insist on one. It does make a lot of difference.

And ... very gentle ((hugs)), whatever you choose to do.