I don't generally suffer from headaches, although I do sometimes suffer from sinus pain, and I had to come off the mini pill because I had a few instances of migraine with aura (but no headache - just aura, and once vomiting).
Last night, I was fine until I went to bed and then had a sudden onset, quite severe headache with nausea - mostly right sided, I think. I took a couple of paracetamol and went to sleep, and woke up some time later without the headache but still feeling like I might be sick.
Looking back to the last time I had anything similar (in August, visual disturbance and nausea but no real headache), it was exactly the same point in my cycle - day 10/11, which is around the time I generally ovulate.
Is there a connection?