This past thanks giving I went on a climbing trip and ended up hiking 3 days in a row on very steep terrain with a heavy pack. There was some pain on the lateral side of my right knee on the last day. A couple days later on my walk home from work I felt so much pain that I had to limp home with my knee locked straight. The pain only started as I was lifting my foot off the ground to start a new step. I rested a couple weeks and the pain left very quickly, but then came back as soon as I resumed my normal activities. I reduced my activity again and started an itbs rehab routine that I did every day for a month. Again I had no pain 99% of the time and any pain I did feel was very minor. After that month I tried a couple short hikes (8 miles over two days). The pain came back on the second hike. After looking into knee structure more I realized that the pain seems to be in the tendon of my biceps femoris. I found a lot less info about this online. But I did read that it can heal in a few weeks. Does that sound like a likely source of my pain? Why is it sticking with me? How inactive should i be? Is it ok to walk to work if i feel no pain? Should I stretch my biceps femoris? Should I strengthen any particular muscles? I'm hoping to hike the AT in 6 weeks is that reasonable? Thank you so much in advance for any one with advice!