Since bringing her home, she has been having repeated short episodes where she opens her…

Hello, I recently purchased a five-month-old female sugar glider. Since bringing her home, she has been having repeated short episodes where she opens her mouth two or three times, makes a faint wheezing sound, and her body jerks or contracts as though she’s gagging. She also occasionally clicks and whines while resting. Between episodes, she is active, climbing, exploring, drinking water and eating small amounts. The pet shop suggested separation anxiety, but I’m concerned about a respiratory or other medical problem.