It sounds like he had a really bad reaction to whatever was used to treat his mites.
The thread http://ball-pythons.net/forums/showt...it-with-AaronP is full of great information on treating mites.
I would replace Phase 3 with applying Reptile Relief, which is sold by Reptile Basics, rather than the pesticide solution since your snake had such a bad reaction to whatever was used on him yesterday. The Reptile Relief is a salt solution that dehydrates the mites, it's not a pesticide.