I have suffered with migraine most of my life, now about 30 years.  Been on all the medications, with nothing the works.  I have taken Topomax and experienced the side effects - slurred speech, concentration problems, reduction in weight, inability to communicate, difficulty communicating professionally.  Topomax interferred with my every day life and had a huge impact at work. 

Everyone has their own experiences with migraine medication and no two people have the same symptoms simultaneously.  If you follow the directions correctly while taking Topomax and experience side effects, tell your doctor right away.  If the side effects impact your lifestyle, your doctor may say 'would you rather have the migraine or the side effects?'.  At least that is what one doctor asked me.  I told him I did not want side effects that were going to make me feel, look, or act stupid.  I told him I would rather continue to managing the migraine without the serious effects than to have the inability to communicate with people or to have the inability to think.

Every migraine medication has side effects.  It's up to you to decide if you want to live your life with them or find another solution.  My recommendation is to see how Topomax works for you.  You may not receive the same side effects as severe as I had, but if you do and you believe it is interferring with your life, then you should certainly consult with your physician.  There are alternative medications - other than Topomax - that could help.

Good luck.