My knees STILL aren't better!?

Thursday afternoon (around 2pm-ish) I went running. After running both knees felt stiff (was an easy run, stretched good, no issues). Friday morning I couldn't walk without getting sharp pains (in my entire knee an also below the knee by the top of the shin) and I still couldn't bend my knees. It is now Saturday night and I still can't bend both knees straight or bend them to my butt (if I do I get really bad pain and someone has to physically push my leg, I can't get past 45 degrees without help). I also keep getting almost a tingling sensation behind my knee at times. My knees also look slightly bruised in the same places. Most of my knee pain is along the inside of my knee caps and below the knee cap. What could I have done to BOTH my knees at the SAME time?? Also, I haven't been doing sports or walking much but I have sports monday, IF for some reason my knees feel better should I play?