There's so many of us struggling with Narcissistic abusers, or just horrible creeps. I had a narcissistic business partner - and yes I know it's an easy label to use, but I had 12 years of it and it wasn't a 'difference of opinion'. And in the last days before I got rid I found a book that actually discussed what to DO about it. It's a us book but was so, so helpful. Mostly they just say ' this is what they do and all you can do is leave' which is true - but sometimes you need to fight your corner.
Anyway it's called Nobody's Victim by Carrie Goldberg and there's a lot about trolls etc in there too. This is the only book I've ever read where someone actually fights back - and wins. It inspired me. I hope it's as helpful for someone else.