Sorry to hear you are going through this. It can be a very scary and overwhelming experience. This does sound like a mix of FND and possibly comorbid anxiety/depression, which can all impact cognitive function. You were diagnosed by a specialist and there doesn’t seem to be any obvious reason why the diagnosis should be questioned. You do not need to have motor and sensory symptoms to have FND. There is functional cognitive disorder which has gone by many different names and is not some newly discovered FND subtype.

There is a lot of ongoing research on functional cognitive symptoms. A positive sign of FCD is that you can remember what you do not remember. That is quite rare when there is brain disease causing cognitive symptoms but it is characteristic of FND. It is often triggered by onset of anxiety, panic attacks, viral infections, and more. Your writers dystonia can be a risk factor as well. There is actually some overlap in brain network dysfunction in dystonia and FND. The treatments are also quite similar in that they are based on “activity dependent neuroplasticity” in rehabilitation treatment.

I would strongly recommend you do not listen to any of these people. They are people who deny their loved ones or themselves have FND which is why they continue to suffer with symptoms. It’s very sad and unnecessary. The need to be right becomes more important than getting well. A lot of the stuff they are suggesting is unhelpful. There is published research on “brain fog” which has found that the term is used to describe a huge number of experiences and it often means something different between people. It is also entirely non-specific and reported by people with many different conditions and also completely healthy people. It is a huge illogical jump to hypothesize that you have long covid, me/CFS or any other very poorly defined condition based on your cognitive symptoms. Also, cognitive symptoms in people with these conditions pretty much meets diagnostic criteria for FCD which is likely the proper diagnosis for their cognitive symptoms.

There is still a lot of work that needs to be done on the treatment of functional cognitive symptoms. Just learning more about it can be helpful. Here are some resources that could help, including a treatment app being used in research for FCD:

https://www.neurosymptoms.org/wp-content/uploads/2021/02/Functional-cognitive-disorder-information-sheet-v1-final.pdf

https://www.alzheimers.org.uk/blog/functional-cognitive-disorder-fcd

https://www.treat-fcd-study.com/try-mementum-app (Click the first graphic which should take you to download the app)

FND is very real, it’s not your fault, it sucks, and it can get better. Listening to people on this site will lead you down a long path of more suffering. I truly hope this evidence-based information and resources help. Wishing you all the best.