It is wise to have a copy of your sleep study report if you haven't already. Your doctor should be able to give you a copy.
Severity of sleep apnea, as Melinda was getting at, depends on the medical criteria as defined by the number of apneas you experience per hour as determined from your sleep study. Mild apnea is 5-15 apneas per hour; moderate is 15-30; and severe is 30 or more apneas per hour. People with either severity can dip into low oxygen.
Surgeries for sleep apnea have a low success rate, and that rate is for those who have mild apnea, so it's necessary to know what kind you experience. If it were me, I would want to know more from the doctors about the swelling of the uvula, and if there's something more going on, like problems with the tonsils, etc. Most apneas are the obstructive sleep apnea kind, but the obstruction can vary per person but usually involving some aspect of the throat. I would want to know precisely what's happening, given what you're describing.
And the guest is correct, the type of mask is important. There are many people who cannot be nose-only breathers, for different reasons. It can be from sinus problems, asthma, deviated septum difficulties, just habits of breathing, or others. Those people need the full face mask. It doesn't cover the whole face, just the nose and mouth, so that you can breathe through your mouth.
You needn't be overweight to have sleep apnea; most are but many aren't. Many regular folks on this forum are not overweight. Weight contributes, but obstructive sleep apnea occurs because of the architecture of your throat, so weight may or may not be a factor. Additional weight can make using cpap somewhat more difficult if it makes it necessary to have higher pressures to keep open the airways. I run a local sleep apnea support group. You'd be surprised how many healthy looking folks attend.
The following link is to a list of various discussion topics about the different types of surgeries, from our Interesting Links section:
Click here for link
Linda