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Could you have suffered a mild stroke that doesn't even show up on an MRI? The doctors think that is what happened to me several years ago. I got up one morning and the left side of my head down to my left fingertips were numb. The numbness gradually went away but left my muscles very weak. Now the whole left side keeps me from walking well. I have much trouble in my knee, weak ankle and foot problems (callouses, etc.) and sometimes stumble because I am not lifting my foot up enough when I walk. I tire out very easily. The doctor's don't even seem concerned about it since they don't have a diagnosis. Good luck.