My ferret is very bloated. He was fine this morning, what is wrong and is there anything I can do?

I had him and my other ferret out on the lawn for a little while today for some fresh air. Hes been eating and drinking fine, Im pretty sure he's gone to the bathroom. He attempts to get up and walk around but he is wobbly. His stomach is clearly enlarged. It almost ten at night, I cant go to a vet. Is there anything i can doo!? Please help:(