Sleep Apnea Treatment

I had septoplasty they think I have scarring that is now causing sleep apnea how is that possible my roof of my mouth vibrates and my snoring increased after the septoplasty. What happened? He is doing a sleep study but cant you tell some other way?
Is this a sign of a bad surgeon? Move septum vibrates too and the roof of mouth only when I sleep? Im not fat it was the surgery