bad headache after each chemo session

I had my 3rd chemo today. After each chemo I usually get a bad headache. I told the nurse today and she mentioned that the anti-nausea med probably causes it. I called MD Anderson and a doctor called me back and recommended I take something stronger than Tylenol. I have Co-codomol 30mg codeine which is the British version of Tylenol 3 so took one and it seems to help. The doctor confirmed that the anti-nausea med causes headache and told me to mention it to my oncologist on the 25th of Feb before my chemo as there is an alternative med for nausea.