New diagnosis of Vocal Cord Cancer

I have just been diagnosed with cancer of the vocal cord (it hurts to admit that!). My PCP says the report indicates that it is in situ and I should respond well to treatment. I've had a consult with radiation oncology. It seems there's 5 1/2 weeks of radiation ahead. With all of the info they gave me, I'm terrified. I feel as if my whole body is involved in this. I suppose I'm a hypochondriac, but I imagine that I have every cancer and other diseases know to man. Anybody have some encouragement or advice for me? Thanks.