Real quick--the doctor at the Children's Hospital diagnosed Sophie's dizzy spells as migraine precursors, and will treat her with a preventative (which she has never taken before) & also prescribed an abortive medication for the next episode (we'll see if that works--another type of med has not helped in the past). The doctor also wants to do a new MRI, because Sophie's balance is abnormal. She can't walk heel-toe, heel-toe at all; she completely loses balances. She's always been like this, ever since she saw the first neurologist when she was 3 (I don't know if she had the problem before that, because you don't usually ask a toddler to do the heel-toe test!). But the doctor thinks the balance issue, along with the dizzy spells, are reason enough to redo the MRI since it's been 4 years since her last one.
I'll write more soon.