There is a condition which causes painless facial spasms, twitches and sometimes contortions. It is treatable and normally benign, but bothersome. I don't know about the swelling.
It is called "hemifacial spasm" - appropriately enough.
You can search for those two words and see if it fits. Also here is descriptive link:
http://www.ninds.nih.gov/disorders/hemifacial_spasm/hemifacial_spasm.htm
Quix
Stres is a possibility. If you have other symptoms, see your physician and get checked out for MS and fibromyalgia.