I am planning on seeing my doctor, but lately I’ve been having trouble falling asleep because of what I think may be acid reflux. The symptoms are very subtle. I have either no heartburn, or very little heartburn. I usually experience the feeling of acid coming up right as I’m about to lose consciousness (half asleep). If I’m laying down fully awake, no problems. It’s only when I’m about to fall asleep. It also doesn’t seem to wake me up when I am asleep.

Also, must an endoscopy always be performed to diagnose this?