I would talk to you OB. I talked to my family doctor & all she did was put me on an antidepressant. You OB may be able to refer you for help. I was reffered to my clinic mental & behavioral health department. turns out they had an open clinic where you can see a therapist & psycharist without having to wait weeks or months. My biggerst advice is tell someone. No one knows how you are feeling unless you tell them. my psycharist started me on Prozac. they will be able to pick the best one based on your symptoms (a psycharist goes to school specifically to perscribe psychartic meds).
this is an amazing website: http://postpartumstress.com