Hi Angel, glad you got your diagnosis and that this can be dealt with. I'm wondering though if all your symptoms are due to it. All what you describe that isn't linked to digestive system is what I experience too. The not sleeping, feeling alert, exhausted but can't fall asleep, brain fog, the shaking and tingling etc... I too felt it was to do with cortisol levels but got this tested and it came back normal.
Did you get you b12 tested? Mine came back normal but I was convinced my levels were low (other blood indicator of low b12 came back very high). I've been injecting myself for over a year now and the shakiness, balance issues, dizziness, breathlessness and pins and needles are significantly better, but the sleep is as bad as ever and so is the exhaustion, brain fog, poor concentration etc...
Are you still on hrt? Did this help at all with some of your symptoms? I tried it for three months last year and if anything it made my symptoms worse, so stopped it. I'm considering trying again another one though as can't keep up feeling as I do.