I used to run 5 miles a day. In November, I noticed that I seemed to be leaning forward as I started to run. Over the next few months, and my glutes and abdominals started to fire pulling me downward and forward. By march, I had to stop running and I now have difficulty walking any distance. If I am standing I have to struggle to remain upright. This only bothers me when I am vertical. I can ride a recumbent bike, I can lift, I can even play golf. My MRI showed "nothing worrisome", I have no tremors and I have full sensitivities. Everyone I have seen says they've never seen anything like it. It seems to be getting worse as I have to exert more and more effort to remain upright when vertical. Does anyone have any ideas?