For last 8 years, I have difficulty registering information in mind, difficulty concentrating on reading, can't absorb information, what others are saying in conversations or explaining me on lecture or phone, my mind is not taking up the information, also have thinking issues like mind is blocked and confusion. I have brain fog . When i go out to work, my mind is in fog, and all activities of thinking, concentrating, are affected. My mental abilities have declined significantly. Need help with this serious issue.