I agree, that is my thought too. I've had experiences like these.

Also some folks have a version of this as part of a migraine, sometimes without any actual head pain.

I don't know that I can adequately describe my own experiences at the moment. But if I had this now I'd tend to wonder if I was extra tired, if I needed to eat, if I was coming down with a cold or other illness, if a migraine was coming on, or if I was extra anxious and stressed. Big changes like moving to a new place can bring on such experiences for me.