Also Sjogren's Syndrome can cause "brain fog" and chronic sleepiness/fatigue. Short naps, quiet moments, and just resting helps. I find I have to lie down for short periods during the day with no noise etc nothing to think about etc, just resting helps my body pain to lessen. Your doctor can put you on something for that also. Blessings to you. It sometimes appears to be a complicated disease until you figure out what is happening to you and how "you" need to be treated.