knee swollen

Chronic Swelling isn't quite right but is the closest catagory unless I have bursitis, which I don't know enough about to self diagnose as that yet. 3 days ago I was walking along and my knee started tightening up. Since then I have been taking vitamins and kyolic, applying ice and taking epson salt soaks. It doesn't seem any better, but it doesn't seem any worse. Any suggestions of what else to do? Thanks, Linda