C1/C2 fracture, seizures, and medication

I am currently being treated for neck pain due to a c1-c2 fracture i had  3 years ago, seizure disorder, and lichen planus, after returning from being overseas. I am on 2000mg of keppra a day, 800 of carbamazepine, and 4 percocet 5/325 mg APAP, nexium, 75 mg of antivert daily. I read that the carbamazepine, percocet and keppra are all bad for your liver, especially together. I need to stay on the two seizure medications but I would like to think there is a way to switch the pain medication. The acetaminophen is what i would like to change, would that make that much of a difference? If so, what should i do , and how? I need some sort of pain medication due to my neck pain from the past fracture, i just dont want to be damaging my liver severely.