Then your doctor will prescribe auto-cpap therapy. Hopefully health insurance defers some of the cost, but in any case it shouldn't be ruinous for someone with an HSA. You can get a Phillips Dreamstation off Amazon for $620.
Please go get tested.
Edit- Sorry didn't see this exact comment below, so I concur
https://www.secondwindcpap.com/
Or you can sell it if it doesn't help you.
If it's an auto-adjusting machine, then you don't need the sleep technician either. You can just start at a lower pressure and look at your data and then see if you need more.
If you are a bit adventurous, go on Craigslist and buy a used one with a new mask for like $100. You probably are a Large mask size.
Figure out how to adjust it and try it for a few days. Keep a written record of how you feel. See if it helps. Starting at 6 of whatever the unit is will probably be a good starting point.
The only annoying bit is replacing the masks and headgear - they’re considered prescription medical devices, so you have to exploit a loophole in that they are only covered under the RX requirement when purchased as a set. So, I have to buy a mask on one order, and the headgear on another.
It’s a pain in the ass and I’m more than a little bit peeved that I have to beg for permission for this quality of life improvement.
Amazon won't sell you full mask sets, you have to buy the frame/cushion/headgear/tubing separately and put it together yourself. Usully at a very inflated markup.. recently had to pay $100 for a replacement frame after one of the headgear hooks snapped off of my F10.
Other CPAP companies online won't even talk to you without a prescription on file.
Weight gain is a symptom of untreated sleep apnea, so you should consider whether you're doing this in the right order.
It's not like I can't afford to pay either, I do have some money stashed in my HSA but when I'm trying to get to a point where I have a full years deductible in it to cover a true emergency it's a bit of a gut punch to suddenly take $X00-$1X00 out to wear a device and then have a technician analyze the data from it.
All of this is why my first step right now is to keep losing weight, because I know weighing 230lbs as a 5'10" male isn't helping me at all either.