This happens to me a lot and has gotten much less scary. I've started wondering if it's an indicator of a bigger issue and if I need to seek treatment. It's hard to find information without proper key words, which lead me to this forum. Not panicking and taking air in super slowly is the only way I can get any air in... then cough or breathe out in hard bursts. Repeating this opens the airway. Thanks to all of you for sharing in this forum. It has helped.