I have been having this weird problem of waking up in the middle of the night generally within 1st hour of sleep, where I wake up suddenly short of breath. It feels like someone stopped my breath. And there is lit of palpitation at that time and hardly able to see properly anything. I have consulted both the chest doctors and gastrointestinal doctors. The chest x ray and lung functions tests and ecg are all normal. I do have mild gastric problems at time. Doctors say it's nothing to worry about. But the thing is it is very scary when it happens almost every night. And it's been over an year now. What should I do?