I Am Having Pain Up The Back Of My Leg.

I am having pain up the back of my leg. It hurts when I bend my knee all the way right behind in the bend. My calf feels like it wants to cramp when I try to walk normally.
Could this be posterior tibial tendon dysfunction? I went to the doctor and this is what he told me. My regular GP was not available. I have been resting and icing it but it does not seem to be getting better.