The weakness is new. He was normal when I fed him on Sunday (10 days ago). The weakness and bloating seemed to come at the same time when I checked in on him last Thursday (4 days post rat)
He's not been dropped or pinched in his tub. He shouldn't have over heated; his basking spot is regulated with a thermostat.
I'm still weirded out by the possibility of IBD. Though none of the other snakes in quarantine are showing symptoms... The vet seemed to think that it was a low probability, and he's only ever seen 2 cases himself.