I really hope you guys are getting propper help, this state of being must be horrible, especially since nothing happened in the end. Nothing happened because your wife after all made sure to not be too far away and was alert enough to hear her call. We're all 2 minutes away from death should we somehow stop breathing, best we can do is to minimize risk.

Me and my wife had a horrible experience ourselves where our 2 year old daughters best friend(also 2 years old) drowned in their family swimming pool after figuring out how to open the door herself. I know this wasn't nearly as close to heart as the other stories in this post, but receiving that text on a Saturday evening was super tough and me and my partner was crushed for months after it happened. It's now been 10 months and we rarely think about it anymore although we did end up in a house WITHOUT a swimming pool, so in a way it's still with us.