Hello , I m a 47 year old white male. I ve been healthy and active most of my life. I had 2 bouts of guillan barre syndrome in 2010 and 2012, but recovered ok. In the past 18 months , I have developed weakness in my legs, so bad, that I can t climb stairs well, and I m constantly losing my balance and falling at work . It feels like my legs are heavy and barely respond when I try to walk. I m 6ft 3 and 215 pounds , lean, but it feels so difficult to walk at times , that i feel like I m having to force myself to swing my legs. Any ideas what this could be ? Jeff .