I don't know that the marriage is helping you so I'd do the separation proceedings but see if the lawyers can have your husband move "away" so he isn't continually adding stress? Then the lawyers can haggle for awhile, assuming you can trust your interests to your lawyer? Just make it so your husband takes a break from yammering at you.

Can you go to your T's less often, like do one every other week so you're still going weekly but alternating trauma with regular therapy?