Reactive arthritis is generally secondary to something. So you need to find the cause. It can be secondary to bacterial infections, inflammatory bowel disease, or due to allergic reaction to something you eat or your body comes in touch with. If along with this you have uveitis (eye symptoms) and genitourinary infection, then its part of Reiter's syndrome, which is an autoimmune disorder. Analgesics, steroids and immunosuppressant drugs form the mainstay of treatment.
Please consult your doctor and discuss these possibilities. Take care!