Honestly if you have a syringe I would advise filling it up with some water and either trying to offer him some water in the syringe or force feeding just so he has something in his system.
poor lil boy, have u increase ur misting? my lil pantha was dehydrated couple weeks ago due to prolaspe and being poorly. I increased misting every hour and dropped water drops on her nose which ran down and she licked off, I also had to force feed for few days and today she started firin for food again!!
I'm no professional and don't have half as much knoledge as some of the great people on here, I hope he pulls through. Be positive and persistent with misting .
Vet. Immediately. As said before he needs subcutaneous fluids as soon as possible. He is very near death judging by the pictures. If you can't get him to a vet tonight I'd put him on a plant in the shower, point the shower head at the wall so that the warm water bounces off and mists over him. He may not have the strength to drink but he has a chance to get at least some hydration in him as it settles around his mouth. You'll have to keep an eye on him though because he is very weak. Make sure he doesn't fall, aspirate, etc. Then get him to a vet as soon as you possibly can.