See? You got some positive stuff going on already, just by reaching out--first to us, then to your Mom.
It must have been really hard for your Mom to just kinda wait for you to reach out to her. But it sounds like she can be a great source of support for you.
Maybe you want to go to your first meeting without telling him exactly what you're doing? Do you really need the drama? The meetings are only an hour or so. Could you get out without an explanation needed?