Hi C.,
I am so sorry to hear about the loss of your twins. I can only imagine how you feel. Good for you for hanging in there!
I had a very strange pain for months after my delivery, it would hit usually in the early hours of the morning after I had been lying down for a while. My doctor told me it was from the separation of the pubic bones that happened during birth, and that it would go away when the bones fused together again completely. It did go away, but it took a really long time, I think at least 7 months. I don't know if this sounds like the kind of pain you are having--if yours feels like it might be in your bones? but just thought I'd give that as a possibility. Best of luck to you, my thoughts are with you.