For last one month I am feeling this strange burning sensation in my right leg. First I feel my right leg getting heat up (from knee to foot) and then there's twitching and numbness and strain like a muscle is pulled or something. It happens mostly when I'm sitting on chair. My left leg and everything else is perfectly fine but I don't understand what happened with right leg, it starts from knee and goes down to foot and also my foot feels like burning and hot. Please help.