bipolar disorde
"I was on this medication for a few years and it worked wonders on my mood.  I can get moody very quickly and while taking this medication, mood swings were rare.  Unfortunately, I began suffering from body tremors and had to stop taking it.  My hands would shake uncontrollably and my head actually shook back and forth.  I didn't notice it but when I would talk to my sister, she would tell me that my head was rapidly shaking back and forth.  That is why I rated this a 9 instead of a 10."