Yesterday in office, I felt pain in my left knee. Whole day I beared the pain. While walking, climbing stairs. It was better while sitting, but even difficult standing up and walking after sitting. Extreme stiffness. I am not able to bend it. Max 30-40 degree. I checked after coming home that it was all swollen just above the knee. The swollen part has become hard after doing massage. I had no accident or anything. I am doing ice massage now. I have high bp from past 2 months. 100/140. Doctor advised to reduce weight and did not advised any medicine. I do brisk walking but not running. Height: 6'2" Weight:105 What to do ? Any tests ? Please help.