I wouldn't put a dog on Cymbalta or Topomax!!! Been on both and are terrible. I have migraines and always in search of something to help me.
I was at a dead end when I was introduced to Neurontin, figured I didn't have anything else to lose. Already lost my job and my sanity why not. It works great! Or at least better than anything else I have tried. I could function again. My sister suffers too and just started taking it reluctantly I might add and to her surprise she has found relief. She took it for a month before she noticed a huge difference and for me it was almost 2 weeks.
It is an older drug and these days everyone is out for the newest thing and man I hate that. It is FDA approved for seizures but widely used from anything from leg pain to migraines. And with very few if any side effects. Good luck.