I don't have a very stressful job at the moment, freelancing and volunteering.
I do however on occasions have mood blips which can cause me significant discomfort (stress, anxiety etc) and those have similar effects on blood sugar. I'm bipolar, so once that takes a turn for the worse, I certainly have all odd hormones kicking around.
I can't entirely say what is the hen and the egg though when it comes to memory and cognitive functions - stress over a longer period of time has been known to have some of the same effects. Lacking ability to prioritize, memory fails, doing everything at the same time or nothing at all.
I think it is normally accepted that stress and illness have a negative effect on your insulin sensivity - that has to do with stress hormones etc, and to some degree I think you could think of it as a permanent state of dawn phenomena if you're familiar with that.
Good luck getting things straightened out again - always orrible when things get out of hand and you have to own up to it, figure it out and forgive yourself. That is something I am very familiar with, heh. Take care.
-M