hi chris,
i am not familiar with the yeast diet.
i know macrobiotically, wheat is okay. there are many things in macrobiotics that are wheat - seitan, tempeh, cereals, breads, etc. however, if you are allergic to wheat or have some sensitivity to it, you can definitely find those items that are gluten-free or have no wheat.
miso does not have wheat :-)
i wonder if there is a way that you can get a confirmation that you definitely have a high yeast activity in your digestive system. aside from this, a good blood chemistry test would be good to do to see if you are deficient in any vitamins or minerals. this can also help to explain how you are feeling.
also, with the weather changing, not sure if you are prone to SAD - seasonal affective disorder. i know i am and it is a transition process for me during the change in seasons to get adjusted. mostly, you become more depressed and irritable due to the change in sunlight but it can affect other systems in the body as well.