Hi SB, FWIW, I think you're heading in the right direction. It's very true that your H's issues are his to take care of - and he will probably need some professional guidance to take care of himself - and you have got to take care of yourself first and foremost.
Not telling him anything until you're out sounds wise. Do the people you work with know what's going on in your life?
BTW...all his antics aside - and given that you're already going to an IC - what are you doing for yourself - not as part of R/M - but just in terms of you? And for you?