My Muscles Have Begun To Atrophy I Have Always Fallen

My muscles have begun to atrophy I have always fallen and had motor control problems a a child. All tests have come back negative for ms and such. I am in continuous Py to keep some strength but it continues to progress this is body wide not just in my legs it is also in my arms and legs. At this point we seem to be more at a loss then anything I just turned 40 and we are trying to keep me from heading to a wheelchair. lou gurics has also been ruled out.