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Arthritis is term for joint inflammation
causing pain and damage to joints.
But there are many types of arthritis like rheumatoid or ankylosing or osteoarthritis
Each has a different way of treatment so it becomes very important to get thoroughly investigated and diagnosed before treatment. Since you have been to many doctors I hope you have been fully diagnosed.
As for pain relief your doctors must have prescribed you analgesic-anti-inflammatory drugs which are mostly used for pain relief apart from treatment of the disease.
I would like to suggest you also try physiotherapy
for better results
Till then pls be positive have a healthy lifestyle eat nutritious diet , you may even need multivitamin
Consult a good orthopedician or rheumatologist