Reddit reviews Contec CMS50F Wrist-worn Pulse Oximeter with Software and Download Cable

You can get a home pulseox and wear it at night, and then upload your data into Sleepyhead. If you make sure the clock on the CPAP and the recording pulseox are in sync, then you can line the data up. This one is the one I got:
https://www.amazon.com/gp/product/B00LN4LCMC

Get your T checked as sleep apnea can fuck up your hormones. Sometimes they recover with CPAP treatment and sometimes they don't and you need to start testosterone supplementation.

To answer your question directly: get an oximeter that records a full night of data, USB to transfer to a computer, and ideally integration with OSCAR (sleep apnea tracking software) for later use with a CPAP. The cheapest option, $40, will need to be taped onto your finger and it's surprisingly uncomfortable to wear all night:

https://www.amazon.com/CMS50D-Plus-24-hour-Uploaded-Computers/dp/B07KWY9KZQ

At $84, here's a much more comfortable version:

https://www.amazon.com/dp/B00LN4LCMC/

But, the real question is "do you have sleep apnea"? Obviously an overnight sleep study (polysomnograph) is best and the at-home versions are pretty good too (sometimes as low as $200). With an oximeter, you're not going to get anything conclusive - at best you might find some denaturations that might suggest sleep apnea. Without something to monitor breathing, the picture is incomplete.

You should also run through a few self-assessment tests might help get a sense of the probability of sleep apnea and the severity of symptoms:

For sleep apnea. This is also what most primary care docs will use:

http://www.stopbang.ca/osa/screening.php

These are also useful:

http://www.sleepapnea.org/wp-content/uploads/2017/02/snore-score.pdf

http://www.sleepapnea.org/wp-content/uploads/2017/02/berlin-questionnaire.pdf

For daytime sleepiness, try this:

http://dev.healthysleep.med.harvard.edu/narcolepsy/diagnosing-narcolepsy/epworth-sleepiness-scale

Yeah, Amazon. This is a cheap one you can use with the sleepyhead application. May need to tape it to your finger to prevent it from falling off during sleep though. https://www.amazon.com/Blue-Finger-Pulse-Oximeter-Sofware/dp/B00B8L8ZXE/ref=sr_1_1?ie=UTF8&qid=1495823798&sr=8-1&keywords=pulse+ox+usb+record

This is a bit more expensive one that will definitely stay on your finger and more akin to the one's they use in medical settings. https://www.amazon.com/Wrist-worn-Pulse-Oximeter-Software-Download/dp/B00LN4LCMC/ref=pd_sim_121_3?_encoding=UTF8&pd_rd_i=B00LN4LCMC&pd_rd_r=Y69Y7NB1659GK7GKS1FG&pd_rd_w=a977l&pd_rd_wg=1XO02&psc=1&refRID=Y69Y7NB1659GK7GKS1FG

You'll get a report like this out of a home oximeter (that is from a CMS50F oximeter).

On mine, notice that between about 2:45-3:30, there's a large variation and the pulse goes up. This is highly likely to correspond to a period of REM sleep where apneas get worse. On the sleep study where there were no apneas reported, what was the sleep architecture like?

I am 3.5 weeks into cpap therapy, and it really got a LOT easier on me after a couple of weeks.

Sleep apnea is diagnosed with an untreated AHI of greater than 5.

What kind of treatment are you getting for your anxiety? Over the counter stuff like GABA or L-theanine? Pharmaceuticals? Therapy? Be sure you're exploring all your health options- I wish I had done so years earlier than I did, because it improved every aspect of my life. Interestingly, my hypochondria was significantly improved when I treated my anxiety.

You are clearly interested in investing in your health. I have been really happy with the logging oximeter I bought. Based on recommendations here and the cpap/apnea boards, I got one of these: www.amazon.com/Contec-Wrist-worn-Oximeter-Software-Download/dp/B00LN4LCMC, and it has been really interesting. My partner wore it for a night, and we learned that the occasional snoring was not indicative of a breathing problem- blood oxygen never went below 90%. Mine is a whole other story! My sibling used it a couple of times during a visit, and is now headed to a sleep doctor to get checked out. It can't give you anything like an AHI, but you could easily compare your blood oxygen levels with and without the cpap to see what it is doing for you.

Good luck to you! Work on that leak. Raise your pressures a little at a tiem if you feel like you're suffocating. I started at 5-10, and now I'm far more comfortable at 7-11.

Don't overlook something like the CMF 50F logging pulse oximeter CMS 50F. It will give you an idea of Saturated Oxygen levels overnight.

I haven't looked at those in a while, but check on the latest. It takes a while for FDA to approve those, so irony was latest version, when I last looked, was direct ship from China and not a USA retailer. It's been a few years, but for $90 it will help get data to show your doctor.