Mela, just a thought.....stand up, bend your knee back, grab your ankle and slowly draw your foot towards your butt. As you do rotate your foot so the arch of your foot lies flat against your "cheek". After that rotate your toes out the other way (your knee is still bent). This will stretch the ligaments on either side of your knee (medial and lateral collateral ligaments) Don't know if it will help but when my knee gets like that often it is because one or other of the ligaments has shifted slightly out of alignment. As I discovered talking to rhuemy a very common side effect to knees that have become swollen and then returned to normal. The ligament on either side of the knee stretch when the knee becomes inflammed and unless they are exercised very rarely actually return to normal. (hence the reason why reoccuring knee injuries happen)
Try it out. Can't hurt. If it doesn't, I'll give the tried and true method. Ice 20 min, heat 20 min alternate for first 2 hours and then apply ice for pain management and heat for relaxation for 48 hours after that.
ps. hope the knee starts to feel better
Worry not for tomorrow, for tomorrow will take care of itself.
Remember healing comes one step at a time, sometimes it seems that its one forward and 2 back but ultimately, always in a forward direction!!!