Big hugs! I'm sorry that you are down right now. Have you visited the GD forum yet? The ladies there are so wonderful and they understand it all. I think TMPOB just got lucky, I really don't believe in them at all...they are 50/50 just like everything else. Do some of the fun stuff that comes with the baby. Shopping, room decorating, etc.
Do you plan on more children? If so, don't give up on your DD yet. And I'm sure you will find the experience of having two of the same some exciting. I want another just to experience same sex siblings.