My husband had the same problems

He took Depakote for 3 months and it was horrible.  He gained a lot of weight despite reducing his daily calorie intake and exercising; his memory was so bad, he couldn't get through a take out order for our family of four without forgetting something; his migraines actually got worse on the drug and he started to feel depressed.  He wasn't able to work the months he took Depakote.  He went on disablity.  Finally, his doctors switched him to another drug and he was able to return to work.  He has changed medicines three times since taking Depakote and still has not found a solution, but he's not having the same problems he did with Depakote.  I really hope it helps you out, it does for some.  I really hope it doesn't do to you what it did to my husband, he was so miserable on it, but he trusted that he's doctors were trying there best for him.  We know they will find him something that works, we just haven't gotten there yet.