So sorry! Not sleeping is horrible! I had postpartum depression with my second child--and ended up with a very bad case of insomnia. That exacerbated everything. One of my doctors prescribed a potent anti-depressant which had the effect of a major sleep inducer. It worked like a charm--although I felt hungover in the mornings. At least I was sleeping.
I'd go back to the doc and see if you can get something stronger just to help you out for the short term. Not sleeping creates all sorts of other ills...