FMH, Sorry for the delay in my response. Working on detachment for yourself and your D will be a great personal boundary to establish, to protect yourself. Everything at first is difficult, but as you use TIME wisely to improve yourself it will become easier. Not a walk in the park per se, bu t better than the walking on egg shell feeling. Trying 180s can also be personal boundaries for yourself too. DB is about You!
Trying to set up boundaries with your H will be more difficult, as he probably doesn't care so much about what you have to say, at least not yet. If I read correctly, you've been there. Use that to your advantage. An insider's POV of what does and doesn't work. .
TIME and Counterintuitive ACTIONS will become your bestfriend throughout this process; and we offer support and guidance as needed.