How can I convince my parents to take me to get a x-ray?

My left leg have been stiff and painful since a few days but my parents don't believe me and I am very anxious about it to the point where I have become what they call a hypohondriac. My parents think I'm faking it because "I don't wanna study " but it's not it. And I'm very anxious I can't do anything even my hobbies. How to convince them that I need to take xray
How can I convince my parents to take me to get a x-ray?
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