Hi Dave,
I've taken Dilantin in the past for absence (petit mal) and complex partial seizures. The drug didn't work that good for me but I've been on other AED'S like tegretol, that have become toxic on me do to the fact that my Dr. had me on antibiotics that increased the drug level of the tegretol. What you are describing sounds like it's toxic I know the last time my AED's were toxic I had to cut back on the meds and I was in bed four days with poison in my system thanks to the Dr. My advice to you is to go to an Epilepsy Center and see an Epileptologists who specializes in epilepsy. They have always had me on fewer AED's. Also try taking vitamin B or vitamin B12 I've found taking vitamin B12 helps reduce my seizures and it gives me more energy. Here's wishing you well and May God Bless You!

Sue