I have heard of various causes for the symptoms you have. Something might be pushing against your airway or you might have a problem with the elasticity in your lungs. But you might have any of dozens of other problems. Right now, it's just too early to speculate on the cause. What need is to find the right doctor. The one you have right now doesn't seem like a very good doctor.
You an ear, nose troat specialist who can get the right tests done. They might even refer you to another specialist.
To facilitate your examination, I suggest that you write down all of the events relating to your problem. Lay it out like you are writing a report and then make an outline for it. It can be incredibly helpful to the doctor to have all of the details in writing and it makes the examination go faster.
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Collapsed throat? 
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