If these increasing RA marker results are from GP blood tests only, make sure you are referred to a rheumatologist and treated by an expert.
Which drugs can you not take due to nausea? If you do have RA (or some other problem that a rheumatologist treats), there's a huge raft of drugs to go at - it can take time to find the one that works for you without causing intolerable side effects. I have psoriatic arthritis (symptoms pretty much like RA, but not symetrical - my joints are not affected equally on both sides) and have been treated successfully in the past with methotrexate - I couldn't race taking it orally is it causes nausea and vomiting in a majority of people taking it and I have a phobia of vomiting. So I had it via weekly injection (done by the nurse at first, then I learnt to do it myself) and, when taken with the prescribed folic acid supplement, I had very few side-effects and no nausea to speak of. I had to stop taking it after 18 months due to other problems with it (it's a powerful drug and they monitor you very closely when you're taking it - some peole can take it long-term, others - like me - can take if for a while then need a break), but am close to asking to go back on it as my arthritis is flaring again and I want to kick it back into its box!
Talk to your doctor - if you haven't god a rheumy, get referred now, if you have, have a chat with them or the rheumy nurse. You should be able to find a more effective treatment than paracetamol and ibruprofen for long-term use, but it might take some trial and error.