What Causes Pain In Hamstring And Tightness In Calf Muscles?

I have pain on the outer side of the knee that radiates down to the middle of the cafe. when I drive the car it gets worst with pushing on the brake and gas, the pain is in the hamstring and the outer side of the knee and in to the cafe. the pain level is high causing me to have to pull over and message the leg or squeeze the outer side of the lower hamstring with my hand. pressing on the top of the cafe firmly gives some relief also. had mri of knee and hamstring, hamstring ok some flatting of inter medial Mencius( but no pain in that area at all) had baker cyst drain. very painful to walk or go up stairs, knee range of motion limited. pain is a 6 all the time on the outer side of the knee. pain came after running and weight lifting squats.