Hey guys, thanks for all the responses. I was completely freaking out because I have never dealt with something like this before, but it appears to have been settled
After 30 minutes of research and anxious waiting, I returned to the tank to find my Pacman (whose name is Newt Gingrich) sitting in his water bowl, and I didn't see a prolapse at all. He appeared just fine. I think I confused the extremely long turd with a prolapse (I was expecting the absolute worst).
I do believe, however, that he was impacted. He hadn't been eating for a while and I had never seen him defecate or even move from his chosen burrow. I looked at him this morning and saw he had chosen a new spot, something I have never seen him do!!
It appears the matter is settled, but I will keep a close eye on him the next few days. Again, thanks to all who responded. I really feel like I'm not alone now!