The last few weeks I have been terrified of getting blood clots in my legs any small pain I get I start to worry. I'm only 17 but not very active and worried this could of caused a clot. My worries have got worse this weekend though. I started getting a small pain at the side of my knee and up into my thigh, and it's getting worse. It only seems to hurt when I'm walk, run, jump, but there is a little ache there when im sat down. It's just feels like a tight sort of pain which worried me because blood clot pain is a cramping feeling. I tried putting some voltaren gel on it and it didn't help so now I'm comvinced it's a blood clot because surely if it was a muscle pain the volteran would help? I'm losing sleep over this because I'm so worried I will die.