Also, if I may make a kind but firm suggestion, regular counseling (no excuses!) and light medication will help you with the anxiety.
I was gaslighted by my ex-Narcissist and it was one of the worst things that ever happened to me. If I knew then what I know now, treating the anxiety (PTSD, really) continuously, making it a priority, and getting serious about it, was one of the primary building blocks to getting me out of that situation.