Honey- I am so sorry you are in so much unbearable pain. Everyone's physical reaction to these treatments is different. Some people do in fact have a terrible reaction to the radiation. I do hope that maybe a break will give you some relief enough to go back and finish it. It is important. I am so sorry you aren't getting the support you were anticipating here.
I had tongue cancer too. I know its an awful thing to go through.
I think everyone was just looking out for you because they want the best result for you.
Think positive and please consider finishing if you can.
XOXOXOXO
KATE