I have a headache every day, it lasts for a few days in between and then I start having pain, now since a few days I am having pain in my back side and vomiting, feeling weak fatigue. And my periods are very irregular, for the last few months, periods come only for one or two days in every 5-6 months. Periods come only one day since last two months It was only a few hours since my last period, then it stopped, I think I started having headaches due to the irregular periods, having headaches daily.