If you're taking Depakote, you really need to call your doctor -- this is from the website for the drug:

Seek emergency medical attention if the person taking this medicine has nausea, vomiting, upper stomach pain, or loss of appetite, low fever, dark urine, clay-colored stools, or jaundice (yellowing of the skin or eyes). These symptoms may be early signs of liver damage or pancreatitis.

Another website mentioned back pain in association with pancreatitis -- which I know is possible, it was one of the signs of my dad's pancreatic problems.