The brain fog comes and goes as the toxin levels in the brain rise and lower, most likely. You can often see it increase when your body is under a little extra stress too - even if it seems like whatever is happening isn't stressful.
And I use Growing Naturals Rice protein powder - no dairy, no gluten and sugar free. I like the Vanilla Blast, my hubby prefers the chocolate flavor.
I use kefir as my only probiotic - but some still believe that it's not good to use when avoiding dairy. Honestly, unless you are allergic to casein (milk protein), it's still a very good probiotic, as it contains 23 different strains of health bacteria and 9 strains of healthy yeasts to help repopulate your digestive tract.
www.culturesforhealth.com/milk-kefir-grains-composition-bacteria-yeast