I'm sorry you've been having unpleasant side effects, pompa, and I hope your GP sorts things out for you. May I gently suggest you should have gone back to the GP when the Co-cod didn't seem to be working. There are other, and additional painkillers that might have helped.
I have been taking several doses of full strength co-codamol daily for about twenty years. For about twenty years before that I took similar amounts of co-proxamol. This has been for chronic pain so that I could get on with my life, which I have done.
I am not addicted to codeine. If my pain eases for some reason, I don't take the painkillers until it bothers me again, so the daily dose varies a bit. I also take a low daily dose of another drug for chronic pain in addition to the co-codamol (this for the last year, roughly), which only works effectively if it is taken continuously.
I have been fortunate not to have had any noticeable side effects. Pain, of course, could be called a side effect, of arthritis or surgery or whatever. I always felt I could put up with milder side effects if that one was dealt with 