Cinnarizine and Diamox

Dear All

Cinnarizine I understand is a calcium channel blocker. But I was told to use it only when I am very very dizzy only occasionally. By just dropping one pill of this actually helps the dizziness for a couple of hours but increases my heart rate to the max and makes me extremely sleepy. I was wondering if it can be used a daily migraine prophylaxis?

Also, has anyone ever heard of a drug called Diamox (Acetazolamide)? My neuro mentioned this drug to me to try if other drugs do not work. Wikipedia says it is carbonic anhydrase inhibitor. I have never heard of carbonic anhydrase inhibitors? Any idea what these are?