Codeine is very addictive and is banned in several countries for this very reason.
You need to go talk to a GP of your respective loved ones about this to seek out medical advice. Failing that, you should contact the local drug advice hotlines in your area and see if they have people specialising in painkiller addiction.
A close friend of mine gave birth a few years ago and, unknown to her husband and friends, she began to secretly take more and more doses of codeine. She was devious about it in that she would ask friends and neighbours if they had any to spare as she claimed she had run out. She killed herself eventually and everyone was shocked.
solpadeinehelp.wikidot.com/ is a place to go to look for advice and there is also a forum there.
Solpadeine and Nurofen Plus are the common over the counter drugs. Co-codamol also.
The full list
Co-codamol
Codis 500
Cuprofen Plus
Feminax
Migraleve Pink
Migraleve Yellow
Nurofen Plus
Panadol Ultra
Paracodol Capsules and Tablets
Paramol Tablets and Soluble Tablets
Solpadeine Max
Solpadeine Migraine Ibuprofen & Codeine Tablets
Solpadeine Plus Capsules, Tablets and Soluble Tablets
Syndol
Veganin Tablets