Thank you for sharing. I've been working with diet in slightly different way, something close to the GAPS diet, which also cuts way down on sugars and also eliminates grains entirely, emphasizes healthy fats, and uses lacto-fermented foods and bone broths to improve digestion. It's helped my physical health to no end and I hope for and expect more.
Sadly, so far it has not helped my mental health at all. I'm not saying it never will, but so far I don't see it.
I bristle a bit when people tell me diet, supplements, etc. will cure my mental/emotional symptoms. There have been a lot of these people in my life. It feels invalidating because it ignores the real problems that caused the symptoms and oversimplifies the scope of work needed to change.
What I can get into is diet as one more tool among the many I use in this healing journey. If nothing else, it's hard to feel calm and positive about life if your physical health is poor.