Need help with strange pain in calf, behind the knee and sometimes spreads to ankle.?

When standing on my leg or walking on it for a long time it will ache really badly and will get worse and worse and gets better with rest. Though I can still feel it later on and if I stand or walk on it enough it will get really bad and a pain in my knee will develop into the night and it will get stiff at a certain point. It isnt stiff fully bent and full straightened but the between bending it between these places it will hit a stiff point which will also hurt my leg. Also a lot of exercise and/or alot of standing or walking on my leg will make this happen. A few times the swelling wakes me up at around 3am-5am because thats when it is at its worse then subsides throughout the next day, there is no visible swelling or change of color except for in my face because I go pale because the pain is so bad. It really hurts at this point and i was given morphine by my GP because it hurt so bad. The next day it will still be stiff and very painful when moved. I am nearly 15 and I need to be going out but can't because an hour of walking or standing and/or some running or jumping will make me unable to walk properly and will give me the pain. Ive had an osteopathy or what ever where they put the camera in your leg a few weeks ago, the surgeons found a bone growing upward and shaved it off and my ligament was torn and fibrous so they taped it down. I still have the pain but the only difference is when i try to make my ankle (i said try because it cant touch it) a pain appears in the same place where i had osgood-schaltters in my right leg and when i move it hurts there. Its in my left leg and its on the inside. HELP PLEASE THIS IS RUINING MY LIFE Tweet