I am 4.5 years after hemiglossectectomy, chemo (Erniyux) and 6 weeks (32 sessions) of radiation. I was getting canker sores a couple times per year. Four weeks ago, I got a few, then clusters that were on inside of lips, cheek, tongue and even some in the back of my throat. Is it possible my body is going through a healing crisis? I am on the Bill Henderson protocol and take B12 along with zinc. No other problems or symptoms. Anyone else have this? Should I be concerned.