Help! Sick Snake!

[Artemis]

I have a sick snake and I dont know why. My temps are good, he is eating, has water... he has been in his hide most all week, I figured he was shedding.... didnt bother him...

they came out tonight and I went to go feed them, and OMG.... my female looks fine... but my male pastel looks HORRIBLE (and they are ofcourse in separate enclosures, before anyone asks)

He is sunken, his spine shows- in particular by his tail.... and he looks stiff and wrinkley like an overstarched shirt, I can actually see scales sticking out like feathers almost... I dont know how else to describe it. I am going to feed him now... but short of taking him to the vet, I dont know what to do.... help please!!