It could be sugar or sugars that are actually making you like that. Hard wheat red and white does that to me as does sugar. I also wake and doze, have depressive feeling, that normally lasts for about 12-16 hours. I can take a little sugar, eg 1 knob without problem. Thing is, is the sugar I am consuming in jams etc from wheat!
The various metformin tests have screwed my vision for weeks, and that after 2-3 days of the rubbish, could not ride my bike for 6 weeks, the car was a serious effort for over 1 week and made me seriously consider stopping driving. I was so depressed with a/ the metformin, and b/ the sugar problem that | seriously considered buying a Lee Enfield, not a Royal Enfield!