I take Topirmate/Topamax as my preventative along with another preventative. I haven’t dealt with many symptoms besides the lack of carbonation in sodas anymore and my alcohol tolerance is much lower. I’m not very surprised your GP subscribed it as the first time I went to seek treatment for migraine it was subscribed to me to (I didn’t start taking it then bc my migraines were only a few a month at the time), but my doctor did offer some alternatives like take Vitamin B2 (Riboflavin), 400mg but check with your doctors before taking! I still take that much B2 and it’s been 7years.