That's known as brain fog - ammonia is likely building in your body as well as other toxins.
Be sure you are doing all you can to detox and you may want to consider adding in something natural designed to help ease this. Some take 'binders' like activated charcoal, bentonite clay or others. The problem with using binders is that you have to have a 4 hour block of time where you aren't taking any meds, supplements, herbs or eating or drinking any nutritional or medicinal drinks as these products will just bind to the nutrients/meds/herbs and whisk them out of your body as well.
So if you take a binder, be sure to take it 2 hours after eating, taking any meds/supplements/herbs or any nutritional or medicinal drinks/teas. Then wait for another 2 hours before taking/drinking or eating any thing else other than water - be sure to drink
lots of water during those two hours!! Binders have a tendency to constipate most people!