You still probably have sleep apnea if you are ever waking up fully without the ability breathe. The human mind can wake up from deep sleep to stage 1 sleep in order to breathe better dozens of times an hour without you perceiving a thing. It only wakes up all the way when it's really bad. In fact, the acid reflux is often a symptom of sleep apnea, attempted inspiration with a sealed off airway literally sucks acid out of your stomach. Get yourself a sleep study. If I'm right, get new doctors and dentists, they all should have caught it by now. Good luck.