Lately I Have Been Getting A Weird Sensations In My

Lately i have been getting a weird sensations in my leg which has caused me to have a couple falls. when I was driving today I had to pull over because i could not feel my leg and had to physically move my foot to step on the breaks. I have been, weak, headaches, lower back pain, have been extremely tired, and cannot concentrate. Do you have any ideas, what this may be.