Sleep Apnea Treatment

I had septum straightened now the roof of my mouth vibrates and my snoring increases my breathing isn’t great sleeping what happened?

the doc has me on a cpap. its not working. i cant get enough air going to my nose.

I get horrible sleep usually and end up peeing several times a night. Could I have sleep apnea?

Sometimes I will wake up in the middle of the night gasping for air. Other times I will be lying in bed and have trouble breathing through my nose which will create pressure in my head. Also sometimes a part of my body will twitch usually my legs, The only thing that helps is if i sit up or stand up but when I lay down these symptoms will occur.
I am 6 ft. 135 lbs. If anything I am underweight.

Looking for something reliable which is maintenance free. Thanks in advance for the advice!