43 is not too old to start menopause, not common, but not impossible by any means. I used to have very heavy periods....lasted a full 5 days. For about the last 8 months or so, they have become one day of spotting, one heavy, one spotting and that is IT!!! I am 37 and thinking that around 40 I will hit the menopause phase for sure.
Anyhow, when my periods started getting shorter, my nipples are SOOOO sensitive. Just the days leading up to my period. I actually have to cover them up in the shower because the water hurts them so badly. I was worried at first thinking I may have somehow gotten pregnant (we are done), but now it happens every month, so I just expect it. Lasts about 3 days for me.