That's about all you can do for him right now...he's so tiny & fragile to start with, & I wish there was a way to relieve his pain but there really isn't. Rest & hope...
I'm happy to hear he's flicking his tongue. If he survives, he might need to stay in "assisted living".I hope you're up for that?
Nice to hear you've befriended bull snakes...I used to keep & breed some, & gopher snakes too... they're awesome snakes.