Thank you for asking the query.
I am sorry to hear about your health condition and will try my best to help you here.
The question you have raised – why your ANA levels, CRP, LFT, RFT, X-ray etc. are normal if you are having Rheumatoid Arthritis is a valid.
I will explain why. First of all there is no single test which can diagnose Rheumatoid Arthritis. Instead we use very scientific guideline called EULAR criteria to diagnose RA. You can see it here : -http://rawarrior.com/american-college-of-rheumatology-redefines-rheumatoid-arthritis-part-2/
So the diagnosis is based on the points you have based on the points. As you can see CRP is just one among the many factors that can be positive in a RA patient. ANA positivity is not needed at all. Infact ANA and Rheumatoid disease have no direct correlation. So essentially you can have negative ANA and other tests and still be diagnosed as RA.
In other words, the diagnosis of RA is mostly clinical – that is by a judicial clinical examination of the patient by an experienced Doctor. From your description of symptoms it appears that you are having Rheumatoid arthritis. So a thorough evaluation for RA should be done. I am sure your Doctor might have already done that. If these evaluations are not suggestive of RA then we need to consider other diagnostic possibilities
The tests I specifically recommend are: RA Factor, Anti-Citrullinated Protein Antibody (ACPA).
The fact that your liver and renal functions are good should be taken as a positive sign.
You should make sure that you are seeing a Rheumatologist or a Doctor with expertise in RA management. Proper treatment will ensure symptom relief and you can lead a normal life.
Hope this helps.In case I have missed any of your concerns, please ask via this email itself as a follow up query.