Sarabeth,
You have been given a lot of good advice here. It DOES sound like you were the unfortunate recipient of sarcoptic mites, sorry. The good news is it is treatable with QUELL, wich the doctor should have written for.
QUELL is a lotion, probably has many different names, but they all do the same thing- you put it ALL OVER, and leave it on for 24hours. This sufocates and kills the mite. The bumps won't go away for a while longer, though.
I have seen this a time or two in the ER, as well as my dad getting them when my brother stuck them with a stray puppy.
Benadryl and topical cortisone will help, but the QUELL should kill it in a couple of days. As for the bedding, as hot of water as you can get, and whatever can't be washed goes into the freezer for a few days. That kills mites of all kinds- including dust mites, BTW. Also works for fleas and moth larvae.
Good Luck, Let us know how you're doing!!