That's great news Lori, I have been thinking about you and your son a lot and what you must be going through esp with the white coat anxiety (which I share). Best wishes for a speedy recovery and a new life for your son free of pain!
A note about sound sensitivities: I have suffered with them all my life and whistling especially can drive me to near homicidal thoughts - it is much worse when I am under stress. I thought it was just my crazy quirk, but I just recently learned there's a name for it: "Misophonia" and apparently Neurofeedback can help (although I have run 17 sessions on myself now and I still intensely dislike whistling so we shall see).