Hello, I Am 63 Female With Multiple Sclerosis. I Have

Hello, I am 63 female with multiple sclerosis. I have been taking drugs to slow the progression, so I am in pretty good shape. I have been having problems with my left knee (swelling and pain) off an on for the last couple years (every 5-6 months). My left leg is weaker due to MS. I have not had an injury to that knee or leg causing the swelling and pain. I have been taking ibuprofin which helps the pain, and wearing a velcro brace from Walgreens, put ice on it the other night...