Gabapentin
"Suffered from headaches for 4 months as I tried Topamax which did not work, and with horrible side effects. 
Been on Neurontin for 10 days, 300 Mgs 3xday. Headaches are virtually GONE.  Kidneys functioning better now that I'm off of Topamax.  Increased appetite and slightly blurry vision are manageable side effects. My life is back. So far, the headache suffering is OVER. 4 months of hellish headaches ended in one week."