I have lived with debilitating migraines for the last 14 years of...

I have lived with debilitating migraines for the last 14 years of my life (I'm 33). I had been on heavy duty pain killers that were prescribed monthly to me -- the dulled the pain a little but, really did not help all that much. Almost 2 years ago I got shingles and my doctor put me on lyrica. I thought I had died and gone to heaven at first when I took it I felt really strange like I was dizzy and not really coherent. After the first week or two I did not notice any side effects and my pain had never been so manageable. For some reason my body gets used to the dosages so it has been increased several times -- I currently take 300 mg four times a day. I have gained over 30 pounds in the last year and I am just afraid that I will continue to gain weight. I am considering tapering off the medication but am scared to death that the pain will be unbearable!!