I had injured my back about a year ago, around that time it was mostly my back that I was worried about, though my leg kept going semi numb (kind of like it was falling asleep) when I was mostly laying down. Skip forward around around 3 months my back started bothering me again and was even worse. My leg seemed to change with how my back was too, instead of being numb it just had random shots of pain in it, kind of like being stabbed. This last bit started in January of 2016, I have been to doctors for it, had some tests done, nothing was found inside thel eg or seemed to be causing this issue. Though around Fed or so I looked at my leg and notice that it had grown 2-3x the size of my left leg. I am not sure of what could cause this or fix it, but it seemed to be related to the back.
On a side note, yes I did go to the doc for both the leg and the back, for the back I was in physical therapy for I think it was 3-4 months, the leg had an =ultra sound and that was about it. I was told there was nothing wrong more or less and nothing to worry about. I never really got told what the injury to my back was, I don't think it's anything super serious, it still bothers me at times but has calmed down a lot. The leg still has random shots of pain through it and is numb to the touch. It is my right leg and only really my thigh. My left leg does hurt at times but it's not in the same way nor is it swollen like the other.