My Pacman, Trevor, regurgitated his stomach today. He's been eating pretty good but nothing today, and his last poo was yesterday, so this kind of came out of nowhere. I was there when it happened, so I washed my hands off and helped him get it back in without him chomping it too much.
Since that, he's soaked in his water dish, hopped around his enclosure a bit, and re-burrowed himself. Right now, he's alert and breathing normally.

Is there anything else I should do? Is this caused by some sort of disease or something? Any help would be greatly appreciated, cause I'm very worried about my little guy.