When I took a breath, I noticed some water enter my mouth. I immediately purged the second stage and had maybe 2 more breaths (w/o water) that felt strained. On my next breath, took in a mouthful of water. That is when I suddenly couldn’t breath in or breath out/cough. Sorry you experienced something like this is well. Definitely a scary feeling.
Given that you had water coming in when you were trying to breathe, it really sounds like a laryingospasm. Basically the vocal chords lock up when a little bit of water splashes on them.