Brooks Kingsnake strange digestion and behavior? (diarrhea and biting himself)

[Bogertophis]

yeah im going to feed him ive never seen anything like this but hes acting semi normal now just exploring in his feeding cage

It sounds to me like he has pain, on & off, & the only way he can deal with it is to bite at himself. Internal parasites (worms) can migrate through a snake's body, & get into organs, causing them to fail. Even into heart & lungs. They wouldn't show up on x-rays either. I wish there was some better explanation I could think of, that it could be...???

There's nothing worse than watching a pet (or person, for that matter) that you care about that's suffering & needing help- but there's only so much you can do.
I hope a feeding helps for now.