Sharp pain behind knee?

Anon

New member
Yesterday, I was sitting down and had this sudden sharp pain on top of my right thigh. It lasted about 10 seconds, now ever since, I have had this really sharp pain behind my right knee. It only hurts when I stand up or sit down, pretty much when my leg extends. It doesn't hurt when I am laying down or generally walking.
I just wondered if anyone else has experienced this as I am wondering i I should go to the ER to have them check for a clot. I have no insurance and no regular doctor, so I don't want to just rush there is I am freaking out for nothing.
Thank you.
 
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