One thing I experience, that I have not come across anyone else mentioning, is episodes of ‘jamais vu’, that is when on a familiar route I unpredictably loose any idea of where I am and how to get to where I want to go. I fail to recognise places or landmarks that I normally know very well.
When walking it usually is not a problem as it may only last minutes or seconds so can be waited out, or I can use general knowledge (eg the pub is behind the church, I can see a church spire and the village only has one church) to compensate, and now I rarely walk far enough that I can not see my destination when setting off. It has been more of an issue when driving.
The longest it has lasted was several hours which as I was travelling by myself I had to wait out in a café. It is more frequent when in PEM, but I have not needed to attempt any driving during PEM for a good number of years. It was a practical issue when I still worked as I regularly would get lost on my commute home. This was before the days of SatNav and now I can just handover navigation to the SatNav.
When I was younger I had a very good sense of direction, generally being aware of the main compass points without any need to refer to a compass. I am not sure when I lost my sense of direction, only becoming aware that I had when for the first time I travelled to the Southern Hemisphere over ten years into my ME. My ‘jamais vu’ issues however arose within the first few years following the onset of my ME, so I don’t know this has any connection or not with my loss of a sense of direction.
[added - since my ME has deteriorated, it sometimes happens within my house. For example I suddenly find I don’t know the way from the bedroom to the bathroom, but is not a problem as the rooms are next to each other and there are only four doors on the landing to check.]