The replies from everyone so far are true. But, nobody will grieve like you, so if you feel lost and alone, then feel it. That is how you feel and don't try to deny it. Please seek a listening ear from a professional. Some friends and family will try to make you feel better and it may make things even worse. A pastor or counselor understands your loss and can help guide you through the naturally occuring process. Peace be with you.
It's difficult to lose a child, but with time it will get easier. I had a miscarriage last month and struggled with it, but am moving forward now. I was even planning on getting pregnant, but the loss hit me hard. I try hard to live by the saying of "everything happens for a reason". We may not know why it happened, but there is some reason for why it did. Take care of yourself.