I developed a cold and sore and swollen knees at the same time, should I be worr!

I developed a cold and sore and swollen knees at the same time, should I be worried?

I may have had a fever with the cold. I did get a fever blister on my lip. I have trouble going up and down stairs. I've never had this problem before.

Go see a doctor. No one here will be able to tell you what it is, and if you are worried enough to ask here, you are really concerned. So go see your doctor.