Lots of pain after whole head Botox shots for migraines by neurologist who says it can't be botox & still get migraines.Advice?

After i get my shots I have constant pain and hurts to lay down for over a week.I also get little cluster headaches with it constantly. I still get migraines and neurologist just tells me the more shots i do the better it will get but dont think this is normal. I also have NASH stage 1 and couldnt be told if this is hard on your liver? How does the botox leave the body?