Thanks so much. I was hoping someone on here knew what i was talking about, maybe experience the same problem. Hopefully I will figure out this problem soon.
I'm sorry we are not doctors here nor have the experience to diagnose. I do suggest that with the little bit of history you just told us that you need to make a doctors appointment, maybe get an xray or ct scan of your knee since it's so painful.
Good luck and let us know how it's going.