I always thought I almost drowned once. If I am reading this correctly, perhaps I was actually experiencing aquatic distress. Which makes sense, because I was able to help myself a little, but the situation also provided assistance.
My first time out in water over my head, without those little swimmers inflatable things on my arms, I thought I could go out and be near the buoy line at a small campground pond. Turns out I COULD, but not successfully and safely.
I sank and surfaced and bounced off the sandy bottom a foot or two beneath my kicking legs. IIRC, I was able to, somewhat wave my arms, and make attempts at screaming "mommy!" but I sucked in a ton of water and bobbed up and down a lot.
Though, this is weird... my early childhood memory of these events is usually really strong, but I absolutely cannot remember what happened between those moments and puking up pond water on the beach. Don't know if I managed to reach the beach by myself, if my mom was able to hear me and get out there, or if a lifeguard or even some other parent was able to help.
I imagine if my feet could never find a surface to shove off of and surface, I would have been in a far more dire situation and would have not had much chance of doing anything other than trying to keep myself alive.