I have been taking 25 mg. at bedtime of topamax for the last week...

I have been taking 25 mg. at bedtime of topamax for the last week. I was prescribed topamax to end my chronic headaches. The last week has been very difficult for me. In just 7 days I have gone from being sharp, aware, motivated, focused and in control... to scattered, unable to focus, can't remember my pin # that I have had for 20 years, stop mid sentence because I can't remember what I was trying to say, unable to hold a conversation, unable to think clearly, unable to interact with my children. My family says I have turned into a zombie. I am not safe to drive and cannot work. I did not take my topamax last night and won't be taking it anymore. I would gladly have my headaches back if I could just feel like myself again. I had no idea it would affect me so negatively in just one week on such a low dose. (25 mg) Be so careful before taking this medicine. My doctor didn't discuss any of these side effects with me, but I did research the drug online before I took it and was aware there were serious side effects, but it never seems that serious until you actually endure the side effects for yourself. The drug is not for me.