I feel like I could just fall over. I don't know if it is actually noticeable to anyone.
It is something we notice that others with us may not at first.
I'd describe it like the legs go jelly-wobbly and seem to tangle each other. Rather embarrassing.
Yeah, like you Shel to me there seems to be a margin where only I feel it, or my wife, but since my vertigo attack I'm taking it more seriously and spreading my arms out to keep balance when it gets too much, and that's when everyone gets it. That's not during usual walking, but manoeuvring around something. Getting on and off my more sporty bikes needs to be carefully prepared, so I keep away from cars and usually close to walls for that.
Your description BlueBells fits to me as well. Except embarrassing: good to lose that mode completely, and I have. Firstly by putting self-care first. Secondly because it makes my invisible condition visible. Thirdly because feeling embarrassed doesn't help, it worsens.
Going deeper I've been noticing this with how I drop or almost drop things, so an arm thing too (of course?). The rest is pretty detailed, short version:
Dropping things like wobbly walking is to me a (brain-)body-foggy (impaired proprioception), but with the arm fog I tend to improve for the worse, and best for me in the end seems to be to just "let it go" and keep calm.
I put dropping things under "Foggies" on my blog a few days ago. Then wondered if it isn't more "body fog" than "brain fog". Since it's got to do with proprioception, "the sense of self-movement, force, and body position." This "is mediated by ... neurons located within muscles, tendons, and joints." So at the moment I'm thinking it may be best to think of it as "brain-body-fog".
For others this might not be so conspicuous, but my brain is able to do so much thinking when it's left to itself, but when it has to interact with other people via direct talking (remembering words) or with my body, that's when the fog starts. So I can't say I have brain fog. Either it's body fog, or brain-body-fog. I'm not sure how much brain is actually involved. And what we sense I think matters more than how scientists describe proprioception. But it seems technically parts of the brain are involved, however not as we tend to think of brain fog as more the conscious part.
Now dropping things I get something a bit different with my arms than my legs:
When I try to move something the body fog can nowadays often make me slightly misjudge where it is or where I'm wanting to put it. However additionally to that I sense that and when I try to correct it, it always falls and so I feel it actually usually makes it worse. I can react either placid or with a small gasp which makes my wife overreact "what's up, what's up?", which also just irritates additionally, cos it doesn't help. Talking about it helps calm the reactions about the reactions. If I were as careful as when I'm getting on or off a bike, it wouldn't happen, I'd prepare focus, everything in me would concentrate - probably increasing strain, blood pressure, overdoing it. As it is I usually just let it happen, and try not to be annoyed, even if it actually is annoying, even if it might take me more time and strain, because the chances are fair that it won't happen and the strain of considering what might happen every second I am moving wouldn't be appropriate....
My wife is sometimes amazed how calmly I just wipe the stuff up slowly, without the least wince. If she gets uptight, I just say I'm doing my best and try not to even wince inside from that either.