It seems you are suffering from sjogren's syndrome which has a classical triad of dry eyes,dry mouth and rheumatoid arthritis
.Patient may have dryness of skin,nose and vagina also.
You must consult a rheumatologist
and get properly investigated by getting ANA factor and rheumatoid factor
Sjogren's syndrome generally occurs in women and 9 out of 10 patients are women and generally it attacks the patient after menopause