Suggest Treatment For Irregular Menstrual Flow With Nausea And Headache

Hi, I've been feeling really weird lately, had my period on April 13th, then on may 13 got what looked like my period, but really light and pinkish for only 2 days, very unusual. Now on may 29 got something like my period again but more red and brownish for 3 days now. Since the 13 th I feel nauseous during the night, no vomiting, have headaches and can't sleep well, what could it be?