Hi I finally went to a GP to see what they might do, before going private. He was more supportive than I would have thought, and I'm getting blood test next week for hormones, sex and adrenal and diabetes. Not sure if he mention thyroid specifically. But he said time of day and fasting didn't matter, but to stop my supplements now. He might then refer me to an endo, depending on results. Does this test seem like it would work, and is there any advice on whether I should fast and go for morning time? My suspected problem is adrenal, namely aldosterone. I wake around 3 times a night to urinate, often wide awake, and I sweat excessively when I exert myself even just slightly, or when it's hot/humid (which to me is over 12 degrees in UK!). I'm 33 and quite active/fit.