Mentally Fraying, Body Falling Apart

I'm falling apart.  Both my mind and my body is slowly coming apart.  It's been getting harder and harder to concentrate.  Even more worrisome is the fact that some parts of my body aren't responding to commands from time to time.  Last quarter, my legs locked up and took a while to walk down the stairs.  There were several times where I couldn't get my hands to continue writing.  I'm broken and I don't know how to fix it.