In answer to your question on how long to take HRT.
Breast cancer risk -HRT for 12mnths or less has no affect on risk. Over 12mnths HRT increases your risk and even when you stop using it the risk remains for up to 20yrs
The absolute risk for breast cancer is small but the figures available are for post menopausal women. There are no long term studies on women taking HRT pre menopausal. Because you still have one ovary you fall into this category.
Endometriosis- it’s probably an individual risk and you need to try it and see.
The blood test used to determine whether you are pre or post meno does not measure estrogen or progesterone. It measure FSH, follicle stimulating hormone, which starts to increase as you age and your ovaries require more stimulation as you age. Over a certain level they indicate primary ovarian failure ( menopause). It is not affected by HRT use and you could request it. Post menopausally, if you have no uterus you probably don’t need progesterone.
I had stage 4 endo, had a Mirena coil from 40-57 and GP added in low dose estrogen which got rid of the mood swings and mild hot flushes. At 40mg via patch it didn’t trigger the endo, however it didn’t really do much for aches and pains. I later found out that that was due to magnesium deficiency.
I had to stop HRT when I was diagnosed with breast cancer ( I was one of the unlucky statistics) and I have now been taking hormone blockers . I was dreading it but apart from the common side effect of joint pain ( not directly down to low hormones) I have been very pleasantly surprised how ok I feel with no hormones. Without fluctuating hormones which happens with HRT to a lesser degree while peri menopausal, my mood is constant. I have had a lot of resolution of the constant background pain of endo because the lesions have been starved of estrogen so have withered away.
I had chronic sciatica throughout my fertile years due to endo lesions wrapped around the nerve. After five years of hormone blockers I am pain free. Well apart from generalised joint pains, but these don’t even merit a paracetamol. Sciatic was constant and sometimes difficult to cope with.
So overall, I benefitted from HRT when meno was going on but once post meno HRT is probably less beneficial for those with endo. In fact being hormone free post meno for an endo women is like having a new body.
You have to factor in natural aging which HRT doesn’t prevent but I can’t remember feeling so good. My abdomen now just does what normal non endo women’s abdomens does. It no longer tortures me on a regular basis. I probably get through a pack of paracetamol every six months rather than every 3 days. That period of my life is a distant memory and I no longer care about my skin, looks or weight because I don’t have to cope with abdo pain.
I’ve currently got a trapped nerve in my neck ( occupational) but it’s nothing like the visceral pain of endo and if I wear a simple foam collar or just lie down it goes away. It also responds to painkillers, endo never did it was always an 8 reduced fro a 10 even with the strongest concoction.
My advice is to have a chat with your GP and if you go for HRT take the lowest dose that relieves the symptoms that bother you.