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

[Bogertophis]

Thanks! Just worried about him and want him to live his best life while also being healthy. Hate to see that he's not feeling well...

I know how you feel... To be honest, it concerns me greatly to hear of a snake biting himself like that, because I've seen it before- a wild-caught Western longnose* snake that I happened to take in-(many years ago); I saw him biting himself & thrashing around, next thing I knew he just died. I was too late to help him. (*Fyi, these are desert snakes are similar to king snakes, smaller though & more slender, with a narrow face, hence the name "longnose".) I still have a longnose snake, the Texas variety- that I got in trade from a pet store that couldn't get him to eat, much less sell him- he's about 19 years old now. They said he was captive-bred (a yearling when I got him) but who knows, it's hard to prove. (These are very hard to breed & raise- because they're so hard to feed- they mostly eat lizards & other tiny snakes, & they're hard to get on mice.) Anyway, crossing my fingers about your Brooks.