Hi sammas, it's a good question and one I've searched for an answer for over the last 4 years myself, are you on hrt?, it's so hard to know because if you research the symptoms of too high/too low for estrogen the symptoms are pretty much identical, I know blood tests are unreliable but I would think it would be the only way to know but in peri that would be more unreliable than post, can't tell you for sure how you know, but just wanted to say I'm in the same situation if you are on hrt try different doses and see what happens with your symptoms, my gp won't test estrogen levels says they go off how you feel, which isn't that helpful when you can't get the balance right, but I can say headaches are definitely what I get with too much along with sweats, but everyone is so different, hope you find some relief soon.