I would be asking a few questions if it started after a spinal/epidural. I just had a baby also and had the same type things you are talking about
...HELLP syndrome etc. My headaches were bad before I got pregnant and pretty bad again after I had her. I have been getting nerve blocks and Radiofrequency nerve ablation for "occipital neuralgia". It has worked well in conjunction with duragesic patches.
check into the spinal stuff, then I would see about hormones (it is a possibility)
good luck, I hope that helped some