I saw on the NBC evening news a few months ago to eat Bing cherries for the relief of arthritis pain. I mentioned it to a friend whose mother suffers badly from crippling arthritis. She began eating cherries every day, and now her fingers have straightened out a lot and she is able to knit again for the first time in several years. Her son tells me it is amazing how well she is doing since she began eating cherries every day. I have no personal experience with it, just my friend thanking me for telling him about it. Maybe it will help you, too.
Google "Cherries and arthritis" and you'll pull up a ton of info.