Try carnivore diet - no foreign chemicals for your body, just exactly what it needs to build and function, in the right ratio of everything. No contents on labels, no additives. Just buy a raw
fatty (very important) meat and cook it at home (add only salt). If you cant find fatty meat, add butter or lard to it. Its the ultimate, clean, elimination diet. Prefer beef. You may add some eggs, cheese, kefirs (clean ones, without sugars, fruit and other additives).
Your physical and also your mental state, mood and energy will get much better. Many mental problems are caused by plants in diet, by herbal teas, sugars, seed oils, coffee/caffeine, oxalates, lectins, pesticides, herbicides and many other poisons in them. Plant chemicals act like drugs, in our bodies. Damaging you if taken constantly. You may even experience withdrawal effect. Its recommended to try carnivore for at least 3 months to see all the effects.
This may help you for the beginning of your personal study: