I find stematil helpful (but it’s prescription only) - it takes hte edge of my vertigo and also helps with the nausea and for nausea peppermint oil is the bomb - you can buy “migraine sticks” here with it an lavender, or just put a few drops on a hankie and inhale a few times. NOt for use if you’re pregnant though
Are you anti preventatives that are non-prescription? I find feverfew/magnesium/B2 combo has helped me generally