In my experience, Depakote has a great deal of good for me in containing mania for Bipolar Disorder. I take 1000mg at bedtime and I lead a very active lifestyle with no issues.
Also, from taking many meds, my Dr. makes it a point not to start 2 meds at the same time, as she says it's impossible to see whether or not it's working, which sounds like what you're facing now.
I certainly recommend that you have a discussion with your Dr. Here are some ideas that you can bring up and hopefully you'll get things sorted as there is no reason for you to feel fatigued all day.
For the 2000mg depakote, are you getting your valproate levels checked? The dosage should be set based on your blood levels. If your levels extend above that window, you may run into some issues. Also, discuss the prospect of tapering down your dose. Depakote is sedating, but also works very well at low doses.
Why are you prescribed Geodon, which is an atypical antipsychotic? Can you try alternatives, such as Gabapentin to treat mania related anxiety or Wellbutrin to treat depression? I've heard great things about the combination of these meds from people I know, my Dr and various research.
These are just a few suggestions that may trigger some better results. The point is, you should be vigilant about getting better and it's ok to refuse to take certain meds, don't be afraid to approach your Dr. in this manner. If you feel uncomfortable or if you're not making progress, look around for a new Dr.
It took me 4 different Dr's before I found one who knew how to treat me properly. I am on the least number of meds at the lowest dose possible and under her care, never suffered with bad side effects.
Good luck.