Speaking is difficult because of radiation treatment over 20 years ago

Will I lose the ability to talk completely? I was diagnosed with stage 4 tonsil cancer in 2003 which was treated with both radiation and chemotherapy. The cancer was eliminated but the effects of radiation have never stopped increasing as I age. I've had PT for swallowing issues and exercises for neck motion to stave off radiation fibrosis but I'm at the point now that nothing seems to help and the prevalent thick mucus is effecting my vocal folds. It takes a lot of energy to speak. Most of the time it's only a whisper and even that takes energy. I use a salt and soda solution to gargle with that temporarily helps with the mucus but when I try to speak to
the mucus builds up again.