Have your knees ever feel like this?

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I went to the doctor yesterday to get my knees looked at. I was told that they were overworked and needed to be rested. There were no x-rays done. He just felt around my knee and moved it around.

I'm thinking about getting a second opinion and was wondering if anyone has ever had feeling similar to this, if you saw a doctor, and what it ended up being.

I always feel pressure in the back of my knee, like when you press on a pressure point and it gets all funny feeling. When I squat down or walk up stairs, or bend my knee up to almost 90 degrees it feels like there is a bruise and something is pressing/rubbing up against it. Sometimes it feels like a stabbing pain. When I'm walking around normally it doesn't hurt but I always feel pressure inside the knee. Sometimes it catches and sometimes I get sharp pains when I'm walking, and sometimes it feels like my knee is being twisted but its not.