seeing spots

My almost 10 year old daughter has been "seeing spots"  first they were flouresant green with hot pink border, ameba like.  I had her draw them for me.  It was the size of a quarter.  then it went to three spots, then it changed color to purple, and she has up to 12 spots at a time.  She has headaches, but not always with spots.  Lots of nausea and "my stomach hurts".   Grades have fallen and behavior at school is not good.  Grades were A's & B's and behavior WAS ok, except for a little talking.  I have spoken to teacher and she says Emily is a "different kid".  MRI was normal.  Have appt with pediatric neurologist April 3rd.  I thought she might have tumor, as my sister in law had one and was told it could be heriditary.  Did not show up on MRI.  I was googleing symptoms and it brought me here.  Does this sound like epilepsy?  Usually has "spots" if not everyday, every other day or so.  I took her to eye doctor who did 2 hour exam on her.  Eyes were fine.  Im interested to hear any suggestions.