You have not had a stroke. This is the most common assumption (the one I jumped to) and the one with which most doctors are approached and need to rule out.
What is going to happen?
How far will it spread?
When it will stop getting worse?
It probably already has stopped.
The onset of Bell's Palsy happens very quickly. Usually people wake up one morning and they have it. Sometimes a slight symptom may be noticed the night before or within the same 24 hours and within those 24 hours all the symptoms have been manifested.
It can, however, take longer; from a couple of days up to around 72 hours, as did my bilateral experience. This is very worrying because one wonders, or more accurately, panics, about what is going to happen next.
The main thing to remember is that this will only affect your face as that is the only purpose of the 7th cranial nerve and that is the only thing ...