Yep could be shed or just your snake. Rosey my big BCI girl will actually breath heavily after I make her exercise around the couch or on the bed. Bumping up the temps is good but don't go above 95F for the hottest spot(that would mean under the aspen right on the tub). If your snake is eating and doing the snakey thing like usual, I probably wouldn't worry. If however you see any mucuous around the nose or mouth or your snake stargazes with its mouth open, then you need to either go back to that vet or go to a different one, whatever you feel comfortable with.