My right knee in the inside has been sore for a few days. This has happened before about 1 and 1/2 years ago. Dr did X-rays, nothing showed up, been for physio nothing found , now it s come back , sore to touch, walking is ok but after awhile it is sore again. A535 works , ice and heat also help. Any suggestions. I have not been excercising. My job , I am up and down a lot. Periodically it hurts but it gets really bad for a few days every so often