In the mean time before your vet app't, please give us more information about your setup, what you've been feeding, what gutloads and supplements used and how often, type of lighting, temps, humidity, is this a wc animal, etc. Considering that your cham has probably been sick for quite a while to get to this stage, and today is Wed, your cham may not get significantly worse between today and tomorrow. I'm NOT saying this isn't serious, but without more info we just can't help long distance and without seeing your cham. Just force feeding without knowing what's wrong won't help. The most important thing is to hydrate it. If he gapes at you you could probably get some rehydration fluid like Pedialyte into his mouth with an eye dropper. Do it carefully and let him swallow on his own. This may help until the vet visit. Chams can go quite a while without eating, and most "force feeding" foods people try can actually do more harm than good. There is a "bug juice" recipe on www.adcham.com that will be safer for him if the vet does prescribe force feeding. It is always a gamble to force feed a cham, and until the underlying problem is identified will just cause a lot of stress. Raise the humidity in your cage, give a lot of privacy, try the dropper method for rehydrating, and get to that vet. Be prepared to describe your cham's diet, setup, lighting etc. to the vet in detail too. Good luck!