Welcome! I'm sorry to say many of us know how you feel. As I lie here in bed in the dark with a pounding headache.
It sounds like the Depakote is working somewhat as your migraines have reduced slightly. Have you discussed the numbness with your neurologist? If your not comfortable with your neurologist perhaps is it time to switch to another one?
Have you discussed any other pain medications with your neurologist? I take Toradol and Aleve before I get to the Codeine. My neurologist and I have a pain management plan - steps I take when the pain starts.
If you're taking Codeine regularly the length of your migraines could be rebound headaches.
I would talk to your neurologist or a doctor you trust and develop a plan together.