I am in no way, shape, or form a doctor. I do however have panic attacks. There is not a general formula for panic, but it sounds like a panic attack to me. Panic attacks usually occur out of the blue and last for a short duration, but can feel much, much longer. Also, hyperventilataion can bring on a panic attack or something similar to a panic attack.
Watch and see if it happens again. If you are truly worried, call your doctor and decsribe to the nurse what happened. Panic attacks, while scary, are harmless. It took years for me to realise that. I am a slow learner, sigh.
I have never had trouble exhaling during an attack, but as I said not all panic attacks are the same. Mine feel as though my throat is closing.
Whatever it was, I do so hope you do not experience it again.
Jennifer
“Live as if you were to die tomorrow. Learn as if you were to live forever.”
-Mahatma Gandhi
"We are what we repeatedly do. Excellence, therefore, is not an act but a habit."
-Aristotle