What are my chances of having sever liver damage?

im addicted to darvocet i use to take 4 pills a night then i cut down to 3 and ive been taking them on and off ofr almost 2 years i dont have any symptoms of liver damage but im so worried ive made an appointment to tell my doctor everything but its not for about a week i think i jsut need a peace of mind do you think i could have sever liver damage? or if my doctor takes me off of pain killers will my liver heal itself? i know its so stupid to take so much but im addicted also what can cause liver damage more pain killers or alcohol?