As for other bloodwork, check off what you want tested on the requisition on your way from the doc to the lab. I do it, and my doc has not once realized things she didn't request were tested. Either the Calgary Lab Services or AB Health website has a listing and explanation of all the tests that are on the requisition form in case you don't know the abbreviation for the test you're looking for.
For your cortisol question, though...avoiding blue light after dusk (tv, smartphone, computer) is recommended; the orange glasses are good if you just can't get away from blue light sources after dark. Going to bed the first time your energy dips in the evening (ever notice if you stay up really late you get tired, then get a second wind, then tired again?) is good. My ND has me taking a short course of phoaphatidyl serine before bed, as I am also dealing with cortisol issues and have been waking up between 12am-2am for the last month or so and been unable to really get back to sleep after. Sleep in a pitch dark room (easier to sleep with a mask on) and expose yourself to light, especially sun, upon waking (will be impossible to do here soon, I know).
My ND hasn't recommended anything specific as far as diet, she's happy with how I'm eating.