I wouldn't worry to much, tempatures in tropical south american, especially in the forests at night during times of the year can get down into the low 50's and high 40's. Pacman's do enter a state of hibernation when faced with a big temp shift, it's skin might look like it's hardeneing (which could explain the white). It also won't eat, but most frogs/toads are like that with significant temp. shifts.
It might be a good thing to get a cheap heat pad and stick it to the side of it's tank for those rare snap cold fronts in Texas.
If it's burrowing though, I'd just leave it - the little bugger knows what it's doing and will come out when he/she feels comfortable again. Forcing it to stay active, or trying to shock it out with heat isn't a good thing.





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