Sleeping problem

Night #2 without sleep....every time I am dozing off to sleep I end up waking up because I feel like I stop breathing and wake myself up gasping for breath. Throughout the day I have this pressure on my stomach and throat and I feel like I can't breathe it's very straining. I have gone to the ER, 2 family doctors, and even the pulmonary center. Everyone told me I was healthy and no problems with my lungs. I believe it might be acid reflux or GERD so dr prescribed me some medicine. It doesn't seem to be working and I am so desperate to find help for myself but where do I go next??? Has anyone ever experienced this?? Could it be anxiety?