Sometimes our families of origin are the cause of our mental health issues.
As painful as it is to lose all contact and support with and from them, it's an absolute necessity for our very survival.
I've had no contact or support from my family of origin, extended family, and/or friends of the family for almost 20 years now.
With one brief attempt to reconnect with a sister, which failed miserably as she betrayed my trust, I have decided I'm better off without them.
I truly feel for you as this is not an easy thing to come to terms with, and I wish you the best as you find yourself trying to figure out what to do with it.
It really is a very intense and painful thing.
ps. I also agree wholeheartedly with the previous poster ... It's imperative that you have some professional assistance via therapy and even a group, if possible, as you work through this. I couldn't have made it this far without it.