I am 54 and was on continuous birth control for many years because of os my migraines. On the advice of ob gym, I just switched to HRT and have had a continuous migraine for about 3 or 4 days. I am wondering what others have experienced in terms of how long withdrawal symptoms last. I take Aimovig and receive Botox so I already use preventatives which have reduced my migraines significantly but apparently can’t control an estrogen reduction.