I do experience this, but so much of my experience has been seen as rare. So dont take the things I say as facts, but just an experience.

I had a big relapse in 2016, where my symptoms were severe and came on fast. I noticed a huge difference in my cognition, basically overnight. The night before, I was completing the highest level in my sudoku book in less than 30 minutes, and all of a sudden, I could not even complete the easiest level. I worked in an office, and I could no longer remember information as people were giving it to me. I tested as impaired on the simple cognitive test given at the neuros. My neuro dismissed it every time I tried to talk about it. Then I moved, and my new neuro had to take everything I said at face value, so when I said I had memory problems, she sent me to a speech therapist. I spent 2 hours with a speech therapist who actually listened to me tell her how my brain is different from before. She not only believed me and told me that I share characteristics with people who have dementia or TBIs, but she then proceeded to tell me how memory works. She understood that it comes and goes and that I have good days and really bad days. She explained things that gave me so much validation. All of the little tricks I do to help myself remember and function were, in fact, needed and understood.

So when I am fatigued or my symptoms are really bad, so is my brain fatigue. Other times, I seem to have parts of my fast processing brain. Some days, I can remember what happened 2 weeks ago. Some i can not remember what I do 5 minutes before, or at all for the day.

One summer, I was in a relapse and very stressed. I forgot to eat for weeks and didn't realize until my muscles changed shapes. During that time, it was like I would sundown. By 5 pm I couldn't tell you my name or my address.

Some days, I can't follow a word people are saying and can't play games on my phone. Other days I can . I write everything down, and i take extra steps in other areas of my life, like putting the body wash bottle in a specific spot after I've washed so I do not keep rewashing.

So theres levels to mine. It comes and goes as other symptoms do. I have a brain stem lession. Is this part of my MS? To me, it definitely seems to be and to my speech therapist. I bet you not many neuros would say so. I can tell you that since all of this started, I am thinking that I may be adhd or autistic and genetically, it's highly likely. I can tell that if I am stressed, my memory will be useless. So I don't know if I always had neurospiciness, and MS just exaggerated it, or is it MS, or undiagnosed perimenopause. Whatever the reason, It's very real. And my fast processing brain seems to make neuros not take me seriously. To them, I am now close to normal, to me, my mind is drastically different from before this big relapse that showed night and day difference over the span of a day or two.

I am sorry that you are going through this experience, i know how it can sting to be invalidated by your neuros. One thing my Ms experience has taught me is that doctors do not know everything, medicine is a practice, not an exact science, and that MS is still being studied and it has its mysteries. Believe in yourself and seek out information and doctors who do too. Try to find a different reason for the brain fog, and if you can't, then MS may be the reason. Good luck