My two cents
I've had that happen during various sports but mostly cycling while attacking a steep climb. Each instance is preceeded by uncontrolled breathing, gasping for air.
My doc explained that this is caused by either too much or too little oxygen in the blood. Oddly the symptoms are very similar for both cases.
Advice, lay off the butterfly for a little bit, concentrate on aerobic activities to train you lungs and practice breathing techniques to make better use of your air.
Keep working and enjoy.
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After all is said and done,
more is said than done.
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