ys definately DBT.
and perhaps look at taking some space.
You dont need to necessarily divorce. Not right this moment, but you have the money when the house sells to take some time to find yourself with DBT support.
At the moment the CPTSD means that you are not really able to be in a relationship and function in a healthy way. You bumbled by in the past burning out as you went, and offering all and everything to your husband, whilst demanding little. And that has fed into your feelings of not being worth it, until it all came crashing down.
You may look back with rose coloured glasses, but it wasnt true, you were trying to be everything whilst not feeding the upstream, and when the well ran dry, you had nothing to support and nourish YOU.
Your husband may have his own issues. It sounds as if he does. But that is his deal to work out. Whatever you had is gone now. Its time is passed. Can it be good in the future - who knows, but the ground has shifted drastically and you are not who you were, but not yet who you need to be.
You can still love him. love who he was. But right now you need to fix who you are. The therapy you are having doesnt seem to be taking you anywhere, its just continuing cycles, and Im afraid that many therapists rely on constant ruminating and psychoanalys, without cure, because thats their trade. Especially in the private sector - its like it becomes an ongoing thing for years, just a well regarded person to discuss stuff with.
You need an actual therapist. And therapy that works for your condition.
Its kind of why sometimes the NHS works better, because they can identify the pathway you need, and not the one you choose.
DBT is considered the go to for the kind of trauma you have had.
Then, once you are feeling stronger, you can see if the marriage is able to be reframed going forwards, whether with boundaries you are both able to get, or even want, what the other is offering or wants themselves.