@hrhwilliam SLP did help my speech a lot. However swallowing issues (late radiation side effect) started a year after radiation. Therapy for that too, Exercise, exercise.
As far as the lingering thoughts of cancer, I don't think they ever go away. In a few days, I will go for another 3 month surveilance. Dread these visits but then will go to 6 months if all is well. I try not to think about it. But with this oral thing, there is always a constant reminder with the side effects of radiation that never go away.