I know I'm perimenopausal, 44, have regular hot flushes, usually before a period. Periods are still regular by the way. My problem is I go from days/weeks to feeling full of energy, no desire to sleep, mood elevated consistently to periods of extreme fatigue, usually lasting a week. There seems to be no patterns to the "mood changes" and don't have a connection to pms (I've charted them). Also, when I am irritable, it tends to coincide with my up/energetic phases. My doc hasn't helped. What I want to know is, are cyclical mood & energy cycles common in the perimenopause or could it be something else? Any advice or similar experiences welcome 