Yup yup. It did the same for me. Even though my first Al-anon meeting was spent staring at the floor and sobbing, I felt stronger, calmer, more able afterwards. The next day I still felt it.
I can't even recall having really 'heard' anything as I was pretty much in a daze, but something must have got through to me. I suppose it was all that recovery seeping into me by osmosis.
The power of positive thinking, positive energy, can't be denied. You surround yourself with it and it really does change your mindset.