Sorry you are having so much trouble. I got a round of occipital nerve injections for my migraines, but they didn't help. They were in the back of my neck, over my right ear, and above my right eyebrow. I could feel the end of the needle hitting my skull which was just gross. Just one of many things I've tried to stop my migraines. Didn't help a bit. Keppra didn't do anything for me either. I'm glad it works for you.
Hope the injections work for you. Let us know how you are doing.