Are you taking any hormone replacements?
You might try OTC meds for menopause first or go back and see your GYN and as for low dose estrogen.
Try phytoestrogens which mimic estrogen. You can find various phytoestrogen products in pharmacies and health food stores. Phytoestrogens include: Soy, Black Cohosh, Ginseng, Red Clover and **** Quai. One product my mother used was Phytolife by Blackmores. It took around 3 months for the full benefits to kick in.