You definitely need to find a vet even if you have to travel. Sugar gliders can dehydrate super fast. Your sweet glider needs a check up. Our glider was doing this and we got an ultrasound of her abdomen, and sadly she had a cancerous mass and we had to make the hard decision to put her to sleep.
I am not saying that your glider has this, but what I am getting at is they can get super sick just like humans can and he needs seen ASAP. In the meantime while you are trying to find a vet, do you have Gliderade to try and syringe feed to give your little guy some electrolytes and hydration? How old is he?