Hi Naomi
Sorry to hear of the problems you are experiencing with pain and the affect it is having on you.
It sounds as though your GP was right to suggest that levels of pain relief requirements were now increased beyond those that you were previously given. Our bodies can become addicted to the meds and as time goes on we need a greater input to cope with the same pain. With all pain relief the objective is to keep it topped up throughout the day and night to achieve maximum benefit.
Naproxen is an anti-inflammatory and the maximum dose is 1g a day (ie 2 doses of 500mg). This should help to control inflammation and therefore pain too. Tramadol is a morphine salt based drug which acts on the brains pain receptor. Co-codamol comes in different strengths, all with 500mg of paracetamol per tablet; some with 8/15/30 or 60mg codeine (the latter comes with 1000g of paracetamol). Co-codamol acts on the sensory nerves and motor neurons. You can take a maximum of 2 cocodamol every four hours up to a maximum of 8 a day. Spread at regular intervals throughout the day they should offer an effective level of pain relief. It needs to be kept topped up every four hours for maximum benefit.
The next stage of pain relief would be the opiates such as morphine but it seems your GP doesn't feel this would be appropriate at the moment; you are already on a strong combimnation! Perhaps in order to relieve the pain and possible potential joint damage now might be the time to take time off from work and give your body the rest it needs. The pain is there for a reason, it is a warning signal that the bodies needs are not being met. With RA there is only so much the drugs can achieve and they do tend to work much better with rest added in.
Just a thought, I have learned a lot from asking questions (always in trouble at school for asking too many questions

), but if you are given info you don't understand ( My GP said that my expectations have got higher.. ) do ask for an explanation. At the end of the day you need that information to treat yourself correctly.
Hope you get some relief soon.
Lyn x