Anyone have awful headaches while taking metformin?

Ashley • 28 yrs old.Married 2.5yrs. Together 6 years. Full-Time Dental Hygienist. TTC 1st child with PCOS. TTC is much harder than we ever imagined BUT it is making us stronger as a couple.. and we have faith
My doctor started me on metformin in conjunction with my clomid. Last month I took it twice a day, but now she has me at 3x a day. Since I started taking it 3x a day I have had horrible headaches (I rarely get headaches) Anyone else notice this when taking metformin?