I don't know how to manage my anxiety, and it's gotten to the point where it's effecting people around me

I can't talk to my mom without her being upset, I can't watch my little sister without her having a tantrum and me having a nervous breakdown. Hell I can't even talk to my closest friends without second-guessing my every word. I've tried what my therapist has told me, tried using facts to counter my anxiety, shit like that, but nothing's working.