Hi,
It could be a blood clot- I would go to the dvm to see.
good luck :)
oh aren't u ever a brave person.....seriously, I don't think the partial paralysis and the expression are related..could be wrong, unless you pinched a nerve or something. But I do think anytime there is a rapid onset of something unexplainable than kitty really needs to see a Vet.....this could be more related to passing a blood clot/thrombosis...and can be extremely painful as well as life threatening!!!
keep us updated and good luck♥