I get them too. They're called vasciculations (spelling?)..I get them in my hand too between the thumb and index finger. They used to scare me but now I just wait them out. They're annoying but common. If they continue or come a lot more frequently, see a neurologist...but for me they come when I am stressed. And they are just like you describe, I feel like my face is beating and if anyone sees me in the street, they'll notice...like my face muscles are losing control! I use a hot washcloth to relax the muscles, I don't know if it helps, but it feels good.