the only time I had that type of thing was after my accident and sever head injury and concousion..post conconsion syndrom. and i had the things you stated you dont have like dizzy and virtigo etc...
The only place i think you might want to post this is the headach forum..even thought you didnt say you get a head ache maybe someone there can have some info .here is the link that will bring you there.
http://neurotalk.psychcentral.com/forum32.html
and I hope if anyone that comes by here can add something..please leave a reply.t.y.
Peace
BMW