Peri menopause: the most debilitating, nausea inducing headaches, coupled with utter bone tiredness. Came most months around day 4 of period. Lasted anything from 2 to 5 days. Couldn't get through the day without napping.
Then cycle became irregular. The headaches continued as before but became more frequent. At their worst, I was literally out of action for half the days each month. I wanted to go back to work (was a SAHM) but couldn't figure how I would be able to hold down a job.
Menopause: as others have said, doesn't occur until you stop your periods. I had one or two at about 5 to 6 month intervals, then that was that. The headaches continued on but with much less frequency and intensity. I am now 8 years past menopause. I can't be sure I won't have another headache but they have gradually got to the point where I just feel a bit tired and fuzzy headed.
Never had HRT. Can say to those who ask if the peri symptoms stop immediately, no, not straightaway, but they gradually slacken off. Apart from the headaches, I had vaginally dryness (still got) irritability (still got but that might just be me, ha!) mild hot flushes (no more), insomnia (still have occasionally).