Lately, I have a feeling of "mental fog". I can't think clearly, make decisions, or maintain concentration like I was able to before. When I read, I find myself having to re-read over and over to extract the information. Also, my memory is not nearly as sharp as it once was. I have problems with numbers and being able to think critically. I was once an extremly intelligent person, but lately, I feel like I have an inferior thought process. Also, my coordination seems different. My entire mind feels like there is heavy fog and there no longer is a sense of being sharp, only dullness.
Also, I have no energy and have to take a nap during the day. I can sleep 10 hours and still feel weak and lazy throughout the day.
What is wrong with me? Any direction so I can consult my doctor? Suggestions?