This is Dr. David
I am sorry you are having such bad headaches
going off cold turkey off of co-codomol tablets can cause withdraw symptoms which can include headaches, nausea, and even vomiting
how long where you taking the co-codomol pills for?
if you go cold turkey off of caffeine and coffee, this can often cause headaches as well.
you may benefit from prescription medications like naltrexone which can help with dependence on opiates like codeine in co-codomol pills.
making sure you drink plenty of water can help.
if you were on the co-codomol pills for years and years, you may have needed a slow taper schedule to come off of them, and not cold turkey which can cause worse withdraw symptoms.
let me know if you have questions.