Wow, Blessings, What a scare!!! I am so relieved that you didn't hurt yourself.

I have had those falling backwards with no warning and can't stop.. It happened often enough that, I make sure something is behind me to catch me, if I fall. I am overly aware of the perils of getting in and out of the shower and transfering to the toilet, that I am so overly careful..

I have a pretty safe system worked out, because I live alone and my doggy isn't big enough to help me. He just sits there and laughs at me.. I do a bird bath every day, but I only get in the shower once a week., whether I need it or not..

Blessings, from now on, when you get out of the shower, move over to where a wall is behind you.....do not stand with only the tub to fall into..