hello and welcome to HCM,
I have understood your concerns regarding the facial twitching and let me tell you with an experience of operating on more than three thousand cases of tonsils that you have nothing to worry about the old method!!
The removal of tonsils will not cause the twitching per say and it is most likely due to the spasm and pain after surgery when your jaw is moving. You do not have anything to worry about and do not think about the same much.
Wait for one to two weeks and the same will go away.
Meanwhile start an anti reflux drug like the pantoprazole
40 mg twice daily before food for two weeks. Your doctor will know about this.
Keep yourself well hydrated and take lots of warm fluids.
Avoid spicy and oily food and you will definitely get better
If it persists then consult your ENT
take care and get well soon!
Dr Sriram Nathan