Hi, & welcome. Did your vet check his stool for parasites (worms)? A snake that bites himself usually does so because of internal discomfort. That could also be explained by his swallowing some of his substrate that is not digestible & having it become impacted -hard to pass. Please do your best to prevent this in the future- feed him on a "plate"- it can be a real plate or a piece of plastic or cardboard that functions as a plate.
The other thing- his super-fast digestion, is something I have SEEN before in a snake that had a large infestation of round worms in his digestive tract. This is fairly easy to treat him for- either ask your vet about this & take a stool sample for him/her to check, or buy some (from a feed store or online source) -a tube of Panacur paste horse dewormer, & stuff some (as much as you can) into the mouth of his pre-killed rodent just before you feed it to him. Expect to see some live worms expelled in his next stool, if I'm right about this. He will likely need this treatment repeated, or like I said, just ask your vet about this. (Vets usually give a higher dosage for this.) Worms are gross, & that would explain all his weird behaviors- the hunger pains because he's sharing his food. Poor snake...
Also: Most experienced herp vets do not dose snakes orally with antibiotics- they're best given by injection, so you might want to see a different vet with more snake experience- You might find this site helpful if you need to find one: https://arav.site-ym.com/search/custom.asp?id=3661
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