Hi, I had a very similar experience to you, 54 and had both ovaries removed in Feb this year, as a preventative measure, due to lots of fertility treatment in the past and a nagging pain from my left ovary. My consultant didn't feel I needed any oestrogen as 3 years since last period. Post op, I gradually went down hill in a period of 2 weeks, insomnia, depression, foggy, faint feeling etc. I am very slim, so my fat cells probably didn't hold that much oestrogen. I have never experienced symptoms like this in my life, I have never been depressed and never suffered from insomnia, in fact I was sailing through the menopause (just hot flushes that were not debilitating and getting fewer and fewer). The consultant wouldn't believe it was hormone related, after loads of blood tests (and finding that no oestrogen left in my body)! I was put on low dose HRT and what a difference it started to make over the course of about 3 weeks.
I then developed headaches, possibly due to synthetic prog and went to see a proper meno specialist (private) where I was changed to oestrogen patches and utrogestan (bioidentical prog). I am just getting to grips with the prog part, oestrogen is great once the right dosage is worked out (trial and error)
I am surprised that you have had a mirena fitted (prog), but have not been given oestrogen, as the prog is used to counteract the uterus lining build up due to oestrogen, he must think that you have lots of reserves left. Perhaps someone else can shed some light on this?
Hope this helps, Rhiner