First I will say that in order for any of the more experienced keepers (not me) to answer this is what they will need to know so you may as well post it now. Even if you have written this in previous posts don't expect them to remember:
species
housing (size, type, etc.)
what you are feeding him
are you gutloading your feeders, if so what
what and how often are you dusting them
what sort of watering/mist system
what sort of lighting (UVB, basking, etc.)
how old and how long have you had him
I just know from being here for awhile that this is what they will need to know so maybe reply to this and put your answer next to each question. I have probably forgotten something but this will get them started.
My personal suggestion for now is to get him well hydrated via misting and or/ making him drink. One thing that I just used for Bart (and used it for a cat with kidney failure) is Pedialyte (or generic brand - doesn't matter) that you can get at a supermarket in the children's section or your local drug store. Give him this in place of water if you can - can't hurt and might help (helps replenish and balance electrolytes).
Also, do you have a herp vet? After my experience with Bart I don't htink I will ever be without this neo-cal glucon - see if your vet will give you some - it's not expensive.
I am sure you will be hearing from others soon so get those questions answered!! 
lele