Thanks for posting in HCM. Firstly,Endometrial proliferation is not normal in peri menopausal state.but it can be controlled by birth control pills for short term.Endometriosis means proliferation of endometrium due to un opposed action of oestrogen.it will cause symptoms like excessive bleeding and pain in future.there is a condition called metropathica hemorhagica where amennorea follows menorhagia in perimenopausal state.so inorder to avoid this you should use hormone replacement therapy which has progesterone,, oestrogen antagonists ,so that they will decrease proliferation of endometrium.if you dont take treatement at this stage this will lead to severe bleeding in near future so kindly consult a gynecologist.thank you.