This could be any number of things, some totally benign and some that need attention as soon as possible. I would call your doctor tomorrow (I know it's Sunday, but leave a message) and explain on the phone the sensation you are having and if you have any other symptoms. It could be as simple as a pinched nerve, tooth infection, Bell's palsy (temporary and self-limiting), TMJ, panic, anxiety, or any number of things that are not going to kill you(!) but you should make an appt. ASAP, in case something more serious is going on.
[This message has been edited by zuzu8 (edited 04-20-2003).]