Topamax. Is anyone else taking this? How well does it work for prevention of migraines?

My neurologist just started me on Topamax last night because I get constant headaches and migraines. I am taking 1/2 of a 25 mg pill for a week at night, then up the dose from there. He wants me to go up on it slowly so it builds up in my system and hopefully starts to work in a month or so.

I am curious if anyone who has taken this med experienced very many of the many side effects that are possible with this med? Some of them do scare me, especially two of them (glaucoma and slow thinking/memory/speech). Is this medicine worth taking considering all the side effects that are possible? Did anyone lose weight while using it (my doctor said it is a good possibility and I know I could definitely stand to lose some weight)? Does this med make you really drowsy, especially when you first start it in the morning (I took it at night to start and already take Trazodone for sleeping so I can't tell if this one makes me sleep)? In other words, what has been your experience using this drug?