Hey Carl,
Welcome. Glad you're enjoying the process of keeping the dome smooth. Sorry you're dealing with all the stuff you've got going.
As Saint mentioned in your initial thread, you might be dealing with seborrheic dermatitis, which I have. I've gotten complete relief from any of the pain, itching, and blemishes associated with seborrheic dermatitis as a result of shaving my head. Bear in mind, it was a little rough initially as my scalp got used to the routine of daily shaving. However, it was well worth it. A clean scalp (including freedom from the tyranny of hair....Thanks SlyBear) is a healthy scalp. Just make certain you apply some type of post shave moisturizer. In your case, it sounds like some kind of mid-day cleaning might be in order as well.
As far as doctor's prescriptions, I've yet to find anything that helped with a scalp condition better than shaving. Again, I'm not a doctor, but I am living proof that shaving your dome is the greatest relief from a painful scalp condition.
Good luck, dude and feel free to PM me if you have any specific questions!
Schro