Botox for Migraines

I have decided to try the Botox treatment for my continued migraines.  I have my first appointment tomorrow afternoon with the Neurologist.  She will inject 31 shots in my head, neck and shoulders.  I am a bit nervous, as I've heard good and bad, but feel the need to give this a try.  I would covet your prayers that this would not make things worse.  It will not provide immediate results and is something done every 3 months.  We shall see how this goes...