Yes, it does help. What's even better is high-dose progesterone to completely shut down the menstrual cycle. Hormonal coil might do it. I take norethindrone at a high dose (5mg) as I hated the idea of having something implanted into me that might or might not work and then being at the mercy of doctors to remove it.
Basically if you can stop having periods, you stop having period-related flares.
Basically if you can stop having periods, you stop having period-related flares.