Unless you live in the Artic, having your snake live on the cool side of the tank will not cause an RI. If your cool side is in the 70's, which it should be because of the ambient temps in the house, there's no way it could get an RI. You need to find out what part of your husbandry is lacking and fix it immediately. You were only gone for a few days to a week. Not enough time for something to happen.

You may need to pay a visit to the vets to find out exactly what's wrong.

Good Luck!
Jim Smith