Are There Any Permanent Effects In Taking Seizure Drugs Like Keppra?

Hi, I was wondering if there are any permanent effects from taking Keppra (anti-epileptic/seizure drug). I ve been on it for just over a year now and we only just cut my dosage in half a month ago, but I m still very irritable, easily frustrated, and not myself. I have had major memory problems since I started taking it--even when someone reminds me of something, I still won t remember it sometimes. Will this go away eventually? I ve read things other people have posted in forums, and some people say people they know who took Keppra never were the same and never got their normal mood and memory back. I just want to be me again. Thanks!