Low Estrogen

I’m 30F and have been underweight all my life - BMI is around 16.7 (which I heard can be considered as anorexia). I’ve been trying to gain weight but I’ve got a stomach that gets easily upset (a combo of acid reflux and IBS).

I get depressed and irritable easily and I’ve always suspected low estrogen - and these days I’ve been using over-the-counter estrogen cream and it’s been VERY helpful.

But then I heard it can be dangerous without progesterone so I tried progesterone cream as well - and then I noticed one of my breasts getting larger and panicked because there’s a risk of breast cancer when you use both progesterone and estrogen. So I stopped using progesterone.

What should I do? Obviously I’ve got to gain weight but even when I gained about 2 kg, I still had depressive episodes. Is it okay to use a little bit of estrogen cream? What are other ways to raise estrogen? I’ve even tried alcohol but it gives me awful mood swings and stomach trouble.

Any help will be appreciated!