Hmmmmmm. I've really not heard of hormone fluctuations triggering CPH. That's generally more a Migraine issue. In that case, hormone therapy it a toss-up. It helps some, makes things worse for others, makes not difference at all to some.
There are some alternatives to indomethacin. You can find that information and other information in Paroxysmal Hemicrania - The Basics.
Good luck,
Teri