rheumatoid arthritis? please help.

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i am 27. recently i started having numbness and tingling pain in my feet. slowly my hands and arms also started hurting, along with a stiffness and tingling pain. can this be rheumatoid arthritis? how do i get tested? My joints are kinda stiff and i often hear a cracking sound when i move my thumbs, fingers or arms. it is really worrisome. i also want to know what kind of medication can result in rheumatoid arthritis as a side effect?