I've sadly had a lot of experienced with escapees and I am sorry for your troubles.

Anyways, this what I did when I had mites, and I manage to stop it dead in its tracks:

Tthe first thing you need to do is isolate the snake from any other reptiles (if you have any). Just keep him as FAR away as possible, and get rid of any wood, since mites seem to be able to breed in it (or something like that). So, if he is on aspen, switch it out to newspaper or paper towels.

Next, soak him the bathtub with some form of mite treatment (really make sure you get him covered in it), even some of the stupid looking stuff in pet stores can work until you can get some real killer stuff, like PAM. I once tested the pet store stuff on a group of mites that I was staring at, and they did die.

Anyways, you then want to treat anything he has come in contact with and the room itself. I used a vacuum cleaner, alcohol spray (be careful because of fumes), mite treatment, and a big, big trash can. Bleach is great too if you need to treat decor and for wood you can always bake it. Overall, just clean until your hands fall off. This will prevent the spread of the mites to your whole collection. If you don't have other reptiles, then you don't have to worry as much.

Keep the snake in quarantine until the mites are killed, and you might want to consider putting a soaking dish (if you can) in its enclosure to help it relieve the mites.

About the feeding:
Just let him be, stick to your feeding schedule and give him lots of cover. When I have nervous snakes that just want to get everywhere, I add lots of leaves and hides then they tend to calm down. Also, make sure you have the right temperature gradient (which I'm sure you do).

If worse comes to worse, you can always force feed him or take him to the vet.