I am 24, I got serious problem when ever I had sex I get really severe pain in legs and its allways there, but if I dont have sex it a bit better, but as soon I have sex, I get pain in legs, if I walk for 20 minutes I feel like I walked all day, which is really bad, and under my eyes I get black circles like I am tired, but its cause of sex too, if I dont have sex it gets better too, if I have sex it worse. Plz suggest me whts wrong with me, I dont want to go to docs, if anyone can suggest any thing that will be appreciated