For about a week and a half now I have had tingling in my fingers. It started on one arm and now I feel it in both hands. I also have back pain in my lower back on my left side of my hips. I cannot sit, stand, or lay on my back for an extended period of time without pain in my lower back and shooting pain down my left leg. My left leg also goes numb occasionally and tingles constantly. I'm in the military and do a lot of physical activity, so I think it might be a sports related injury. But I'm afraid it's something seriouse like a spinal injury. What's wrong?