Codeine's one of the best painkillers around, but if it's a brand that's mixed with anything like paracetamol, then don't take anything else. You can mix it with Ibuprofen for really severe pain, but I'm not sure of the quantities.
If you've already been taking the aspirin (which sometimes works, but it depends on the pain and the individual), then allow four hours before you take the codeine, just to be on the safe side.
You have my sympathy, MWB - I've been there many times. Hope you get on OK tomorrow.