Hi, Rick. First of all, Congratulations on finishing your radiation treatment. You sound like you came through it pretty well....better than I did, but I had chemo too. I'm glad you made it through with your sense of humor intact.
I had the white spot thing, too, on the back of my throat ( I had tonsil cancer). It may be thrush. My ent recommends mouthrinsing with half salt/half baking soda, he also said to try rinsing with apple cider vinegar. I wound up having thrush pretty bad, they gave me a 2 week course of diflucan for it with a magic mouthwash that had nystatin and tetracyline in it. Worked like a charm.
I also had the nodules in my lungs. They showed up on a follow up PET scan in December, then were gone on a CT scan in Jan when I went into the hospital to have them needle biopsied. Just had a CT scan last week and there was another, very small one in a different spot. Radiologist and ent both said they can be viral and can come and go. They arent worried about them until they show up on successive scans.
Best of luck on your recovery, hope things continue to go your way.
Mike