Sorry to hear that, I feel your pain.
All I can say, is search out people in your life that are a strong support. And look after yourself... I know you probably can't see past this right now. But as time goes by the lows aren't so low anymore.
I have a little girl who is Severely handicapped so I know that pain you are feeling.
People will say that DUMBEST things, what I would do is have an Ally McBeal moment... and imagine slapping them!
Just remember you don't have to be strong. its ok to feel.
Let us know how you get on.