I have pain behind my right knee andon both sides. I'm on my feet all day as a waitress and have a achilles tendinitis bursitis and two bone spurs on my left foot. The pain started about a week ago and has gotten worst . Could this pain be cause from favoring my right leg due to my left foot problems ? At work today the pain would shoot up the back of my leg and I felt like I was going down.... the pain is less when I'm at rest and worst when walking