I cannot comment on the Depakote, but I stopped taking Geodon about 3 months ago and for 7 weeks I suffered from insomnia, anxiety, and lack of appetite. Now that my body has recovered, I feel much better than I did while on Geodon. You may not have the same symptoms that I had, but I would recommend at least a 3 week taper. Good Luck!
You should be under the care of a doctor for this...the withdrawal effect that is most worrisome is seizures that can occur if withdrawal is too rapid and not covered by another medication for weaning and safety purposes.