The reason I asked about the spinal cord headaches is that sometimes the site where the epi was placed will not heal correctly and/or the membrane that surrounds your spinal cord will get nicked in the process causing spinal fluid to leak out causing spinal headaches.
I have had them twice once after a botched spinal tap and then again after my epidural. I ended having to lay on my stomach for 24 hours straight to get the hole to close up properly.