What Are The Side Effects Of Excessive Masturbation?

Hello Doctors, Plz, I am asking for help. I used to practice masturbation since many years (I am 24 by now), and since two years I was feeling some pain in my right leg (in thigh and foot), especially when I bend my body the pain increases in the knee, that lasts for few days after mast practice. Recently, I had extreme pain after the masturbation and now I am very sure that this is the reason. I stopped it since one week, but the I feel my leg is weaker with extreme pain while bending the knee or even walking. I do not know what to do, I am really worried and feel guilty cuz of this. Plz any advice for medicine or any way to get rid of this pain. I am very ashamed of visiting a doc and tell him the story. Thanks