I agree with Dancinggirl, definitely try Oestrogel, it should work better and give you flexibility. I developed migraines just before my periods stopped and I had a Mirena coil at the time. In my particular case, the synthetic progesterone in the Mirena was too dominant and triggered my migraines because my oestrogen levels were too low. The patches were completely useless and hardly even registered on blood tests despite my being on 100mcg dose. If you are anything like me, you will need a fairly high dose of oestrogen to counter the progesterone and (certainly in my my case) only Oestrogel can provide that type of delivery and instant oestrogen hit.
I had my coil removed but I wish I had tried the Mirena/Oestrogel combination.
Also make sure you are not low on magnesium or vitamin B12.
Note: these are my personal experiences and other members may have had different experiences and will not necessarily agree.