My Poor Aching Knees

My knees have been feeling really bad lately. I've had issues with my knees in the past. I've had tendonitis in my knees a couple of times. I didn't have any problems for quite some time until we started working 10 hour shifts at work. I probably end up standing for 8-9 hours during a shift. It's been especially bad the last 2 or 3 weeks. I finally went to the doctor yesterday. He gave a prescription for Motrin 800 and told me it should clear up in a few weeks. However, me knees hurt more today than they have before. It started almost instantly, and the Motrin seemed to do nothing for me. I'm hoping that if I rest them on my next days off and keep taking the Motrin, they'll start to feel better. This is just one of the many reasons I can't wait to be done with the 10 hour shift.