Wow, that was an empowering dream, and if you can do it while you dream ( and your subconscious is free to do whatever it likes) then you can also do it when you are awake. It's your mind sending you a message that you have the strenght to say NO, and that you are able to do this
Looks like you are in the right mindset to stay sober.
Also i'm sending positive thoughts for your mom. I hope evrything goes well,
My best wishes,
LS