Hi Kim, relax because you're now on the way to being better. Your 'score' of 17 is considered mild to moderate, so not a huge deal, but important to treat all the same, especially as it's apparently making you feel bad. Respectfully, the OP stated 17 in 20 minutes. That's 17 events in 1/3 hour; tha...

The S9 uses a 2 GB, speed class 2, SD card formatted as FAT.

The average person exhales about twice as long as their inhale.
To a new CPAP user, it may seem difficult to exhale against pressure.
EPR can help with that as it lowers the pressure one exhales against.

Most people just become accustomed to it.