Hypothalamic amenorrhea

Does anyone here have hypothalamic amenorrhea where your body does not produce estrogen due to your eating disorder? I do and it causes me severe hot flashes and feeling hot all the time and I can't stand it. I have been suffering for over 6 months with this severe hot flashes and I've tried black cohosh for 2 months 80 mg a day and it only took like it's 5% off so definitely not enough. Then I went to the gyno who did blood tests and said that I am making less than zero of estrogen so she recommended the HRT estrogen patch 0.075 mg and I've been on it 3 weeks now and I've gotten no relief. I know obviously that the goal is to get to a normal weight and hopefully my hormones will turn back on but if I'm not able to or even if I am able to and the hormones don't turn back on and help with the hot flashes what do you know of that would give me relief of the hot flashes since that's what the doctor is searching for at this point as am I? I mean if the HRT doesn't work? Would you think the birth control pill would work since it has more estrogen in it? Or do you think I should try a higher day such of black cohosh? Or she suggested Estroven over the counter but I don't know how effective that is... If you know of anything that gives good relief from hot flashes please let me know