Hi Libra...I had VERY heavy, clotting and irregular bleeding over the last year ( maybe more...I don't remember lol). I have been experimenting with HRT since that time, and have found dramatic and remarkable improvement with progesterone ( prometrium here...utrogestan there i believe) taken intravaginally from day 12-14 for 101-12 days. Often in the perimenopausal period you have estrogen but you don't ovulate...makes for some REALLY heavy bleeding in a lot of women.
I have gone from 7-11 days of spotting, then heavy bleeding every 20 to 40 days to 5 days of medium to light bleeding, no more clots, every 28 days. I use 200mg ( If I wasn't on estrogen I think 100mg would work..but may need experimentation..higher doses to protect the endometrium if on estrogen i suspect is wise). It's a option instead of taking something oral ( which has more 'whole body' effects) and may also help with sleep etc. Mirena is another option ( and one I'm still considering myself but haven't worked up the nerve yet). I have heard mixed reviews from a lot of friends...most of whom are not perimenopausal.
I've come to the conclusion that a LOT of women only need progesterone in the early stages of perimenopause when estrogen is high ( sometimes higher than normal)...think sore breasts midcylce, weeping, jittery feeling etc. High estrogen.
Good luck
tara