Lose control of bladder when getting out of the pool and other times?

The past few weeks I've been having trouble with my bladder control. I'm 17. I'm on xyrem because I have narcolepsy. One of the side effects is incontinence. I wet the bed sometimes on this medicine. But I'm wondering if it's something else, because I literally had a full stream coming when I got out of my pool today and I couldn't stop it. I'm 99% sure I have POTS, but my neurologist thinks I'm a hypochondriac, and I don't see my cardiologist for another few weeks. Any clues? Advice?