Not bonded to my baby..

Please no rude comments.... I'm 34 weeks & I can't get myself to be fully excited or happy about having a boy. I was so excited and ready and eager to meet my daughter but now pregnant with a boy I feel nothing.. Just kinda dreading it all. I have bad depression so I'm worried I won't want anything to do with him.. I don't want to be that way but I don't know what to do.. My daughter was planned, wanted, my favorite, my best friend, but two years ago I lost custody of her and by no means am I over it.. I cry everyday and every time I talk to her...how can I love this baby if the one baby I did want I can't.. My heart is torn and hurts.. How can I stop this pain...? And learn to accept my son?