I was on Depakote for two months and it caused hair loss for me as well. The hair on the front half of my head is half as thick as it used to be.
Depakote also caused weight gain (in conjunction with the Zyprexa I also take).
I stopped Depakote on my own about a month ago. I hope my hair comes back soon - some say it comes back in curly! It is not recommended individuals stop their medication on their own and I am not recommending it.