irregularities either ovarian, adrenal or pituitary hypothalamic origin can cause irregular cycles. The cause for irregular cycles has to be elicited by doing hormonal assays on specified dates of menstrual cycle. Clomid
helps in causing ovulation(egg-release) if there are anovulatory cycles due to ovarian causes. Severe headache
before menses is a sort of premenstrual migraine
. Did you ever have such episode before? as you keen on conceiving, please focus on getting thoroughly investigated to find out if there is any male factor for infertility and also the exact cause for female infertility
. Only then you can expect good results.
Wish you the best!