The pain can be because of various factors, depending upon if the pain is also accompanied by the weakness of the limbs then a compression / injury to spinal cord may be indicated. To make sure you have an intact neurology please visit a neurologist so that a MRI Investigation can be suggested if needed. Rheumatoid Arthritis has many other components to it other than pain which may support it.
You can then follow symptomatic treatment as advised by neurologist / physician.
and may be advised for further rehabilitation programme. viz. Physiotherapy and Occupational Therapy.
Next Steps
Seek an Appointment with neurologist and under go assessment and investigations.
Health Tips
If required you should move to a good multi-speciality hospital where you can be assessed and provided the treatment under a one roof even if it will be expensive it would be worth if treated well in time. Stay Healhy