Lower his temperatures--80 is a little high and if he is stressed or ill temps that high could make it worse. You want to shoot for a high of about 78.
Were you feeding insects? Could that be the reason his mouth is full of coco fiber? if not, sometimes when a gecko on loose substrate has seizures they get a mouthful.
I wouldn't soak him unless he seems dehydrated. The less you handle him the better right now--you want to reduced stress as much as possible.
Make the kritter keeper extra humid and provide a source of water for him to drink. Leave him in a dark and quite area to rest.
It's probably not worth it to take him to an emergency vet at this point unless that vet specializes in reptiles. If he is not much improved by morning I would get him in to see a herp vet ASAP.