Have you seen a vet yet?
If it is affecting the other one at his house in the same time frame, it may be something they ate as well. Perhaps not digesting well, or impacting. ???
Just throwing things out there. Like stated, a vet is in order. If you do not know of a herp vet in your area, here is a site with a list of reptile qualified vets all over the country.
Herp Vet Connection
I am sure there is one you can at least call. Good luck.
Ciao,
Rick