Does anyone else feel like a fraud even after 10 years?

I've been practicing for 10 years. I have good reviews, patients seem happy, but I constantly feel like I don't know what I'm doing. Every case I second-guess myself. Every complication makes me think "I should have known better." I'm terrified someone will figure out I'm not as good as they think I am. Is this imposter syndrome or am I actually bad at this? How do you deal with it?