Hi, I am 61 years old. Recently visited my doctor for overall just feeling bad. Not feeling at all like myself, feeling like I am in a fog, very tired, lack libido, no interest in sex at all dr. ran a series of blood work test, WBC, , did a Hepatic Function Panel, T4, TSh All came back as normal. Consulted me that is was probably hormonal, stress fatigue. Prescribed Estradiol 0.5 mg. My question is without doing a hormone check how does she know this is going to help? I don t know if I am low in estrogen and high in progesterone or vice versa. And how long ami going to take this. My sister had breast cancer and she told me it had to do with her making to much estrogen. This scares me.