Just been diagnosed, next steps?

I was diagnosed with sleep apnea, with an AHI of 15.1. I did a private at home study, and was wondering if CPAP is definitely the way to go? I nearly fell asleep walking today and have felt on edge for years at this point, so I’m hoping that a CPAP will change my life and mental health like it has for a few people because it is in the toilet. Will the CPAP significantly reduce my symptoms?

It also said that the mean oxygen saturation was reduced below 91%, which the doctor was unable to explain, since I have no other conditions. My heart has been examined as well as my lungs and was given the all clear, and I am a healthy weight. So that was weird!