Knee Pains in my right knee?

I have been having this knee pain in my right knee for quiet some time now. I went to the doctor before about it but all he did was give me a knee bace.I use it but the pain is under my knee cap. It hurts really bad to extend my leg straight or even bend it and walking is hard, even walking up the stairs is a... show more I have been having this knee pain in my right knee for quiet some time now. I went to the doctor before about it but all he did was give me a knee bace.I use it but the pain is under my knee cap. It hurts really bad to extend my leg straight or even bend it and walking is hard, even walking up the stairs is a chore. I have a doctors appointment today but im afraid he wont do anything again, this knee pain has been going on for about 4 years now im sick of always being told it will get better and it will go away. My knee pops when i walk up stairs, it is swollen and the pain is under my knee cap not on it.what do you think the pain is?
9 answers 9