You mentioned before you keep repeating the same pattern. Perhaps opening up properly is one of the things you haven't yet tried. Maybe it will lead to the breakthrough you need. You can't know unless you try.

What is the worst thing that could happen? You'd be sharing things you already know. Your therapist can only offer perspective. You can take it or leave it. They are not there to judge, only to help. They can't fully help you unless you let them in fully. Not all therapists are helpful, but you're in a bad place and it seems worth the risk at this point. I wish you all the best with this. You've been quite brave lately. You've got this!