Some deep brain fod is die to leaky gut, what you are referring to resembles a brain fog due to detox. It will last as long as you need to detox, the presence of toxins, circulating in your blood so as to get out go through your brain and cause brain fog.
I am a student and at times I just stop detox so as to be able to concentrate properly.
Other options to ease it a bit are antioxydants: vitamin E, C A ( fish oil), calcium and Lecithin. This should help.
just as having a bowel movement a day.
The fog will lift slowly as you detox. You can slow down on the treatment if you find it to difficult to cope with, this is not a race, but expect brain fog when you are doing detox.