Shropshirelass, something that might be worth running by you, when I was on a really high dose of oestrogen (or my own levels were too high on top of hrt, who knows) I had awful headaches and dizziness. I started lowering the estradiol gradually and, as you know I've still got a bit of something going on here and there, but I'd say I had a 98% reduction in them. What's more I had the strangest period, with lots of pain, as if giving birth (not really bad but nothing I have ever had in my life, plus off my food and in bed for the day). It all resolved after that, I think the high level of oestrogen has thickened the womb lining too much and that coincided with all these symptoms. I'm still working on it but it was so obvious that I thought I'd better share with you should you want to get oestrogen levels checked or down, it might be you've had a swing in the direction of too much atm.