Migraines in toddlers.

I myself have suffered since a young age with migraines. My 4 year old is now showing the exact signs. She will go days with a headache, which knocks her out, and she describes it as fuzzy in her eyes (exactly how I would describe mine if I was to really simplify the terminology!) She wears glasses for reading, etc, but since having them prescribed 6 months ago, her headaches have not eased. Has anyone else dealt with this in such a young child? And if so, what did you do? Thanks in advance.