I started on topamax 25 twice daily for 2 weeks for migraines, and was having terrible nausea, tingling in feet, feeling more emotional, mixing up my words, and mental fog issues. It hasn't really made a difference in my migraines. I've stopped taking it the last 4 days. My Dr finally got back with me today, and wants me to increase to 50mg twice daily and thinks the side effects will subside, any advice?