At AF and for a few days I can get the night sweats and headache and hot feeling, all because of very low estrogen (for me, it happens when E2 is less than 30). Same feeling as on lupron. As soon as your ovaries start to grow a follicle you will likely feel better. Yeah it probably means your FSH is high this month, but it doesn't mean you won't grow a follicle and ovulate like normal. It doesn't happen every month. Good luck to you.