MCL Strain

Hello, I am in Iraq right now and I was out for a run and did something to my knee.
I attributed the pain to some unstable ground.
I rested for a few days and then tried running again, not a good idea. For the days to follow I was in excruciating pain.
I notice the pain if I am walking a ways I have not attempted to run since Sept. 15. Also, the pain is very noticeable when I sit for a long time, i.e. the 15 hour airplane ride. Upon returning to Iraq from leave I went and saw the doc that we have on base.
She is a runner too and diagnosed me with a MCL strain.
She is the best we can do out here in theater.
My question finally, what strengthening excercises can I do out here to repair this injury. Keep in mind, we don’t have access to a lot of the tools that are available in the U.S.
Thanks much.~Michelle