My knee replacement is scheduled for next Wednesday. A few days ago I had pain from a superficial Clot (varicose veins). My doc in the box gave me oxycodone 5mg and it made me sick as a dog. I already knew I couldn't take codeine as it has that effect on me. Now I am worried that pain control is going to be a big problem for me. I know the nerve block will help for the first 2-3 days but what about after that? Anyone else who can't take pain medicine without getting violently sick?