Hi carriec,
Thank you for your question and being part of the Migraine.com discussion forum!
Your GYN may be better equipped to answer your questions about how to taper off YAZ and HRT. I can help you with migraine information.
As far as migraine prevention goes, there are over 100 medications that can be used to treat migraine and headache disorders. If you add up all the combinations that number goes up dramatically. You can read more about this here; https://migraine.com/migraine-treatment/prevention-medications/.
Best of luck and keep us posted on how you are doing,
Nancy