I have read about this in an AMBA news letter I am sure. Have you contacted AMBA? I'm sure they have info on twin bereavement, but I'm not sure if it's of the kind you are talking ie. in the womb or if it is later in life. It's worth a try anyway. Also I would try googling too, I am sure people have written about this also that may be helpful to you. Good luck and also sorry for your loss.