If it is Bells palsy, I had a relative who got that. I was living with her at the time and had her massaging the affected side of her face every day. By God's grace, she got her smile back! So, while you are trying to get into the doctor, massaging the affected side multiple times a day might be worth trying.
It could be the surgery - or it could be something different like bell's palsy. See a doctor immediately!!!