Welcome to the forum,
Some thoughts on your issues. First, an AHI of 7.5 is not real high. On the surface one could question how much benefit one could get from reducing the AHI from 7.5 to 2.5. Some, but not a lot. Then there is the issue of the discomfort in getting used to the machine and especially the mask. There is definitely an irritation factor that does not improve sleep, until you get used to it, and maximize the comfort of the machine. You seem to have had some fairly serious oxygen desaturation events, so it is possible that your AHI is underestimating your apnea. AHI is based on the number of events, but not the length of them. Perhaps you are not having many events, but the events you are having are longer in duration. SleepyHead should help you with that. Just beside the Details tap is the Events tab. You can then click on the type of event, and it will show you how long each one is. Mine seem to range from 10 seconds (the minimum to be called an event) to 14 seconds. I was a reluctant user of the machine (I have the AirSense 10 AutoSet too), but over 6 months I have gotten quite used to it, and I am at the point where I can say it really does improve my sleep. It takes time, and a lot of fine tuning with both the machine, and the mask type.
On your question about the type of machine it is, the colour is the give away. Your SleepyHead may identify it as well. The standard machines are black except for the humidifier reservoir. The For Her machine is a cream color with a floral or leaves graphic on it. The For Her version in my opinion is the better machine. The For Her mode is selectable and you can run the machine in either standard mode or For Her mode. It is part of the setup. The For Her mode can be more suitable for someone using lower pressures and having more flow limitation issues than apnea events. It is not so good if you have obstructive events that require more than 12 cm pressure. The good news is you can try both modes and see which one works the best for you. Here is a link to a manual that shows you how to switch the mode. It is worthwhile to download the PDF so you have it for reference. It also has a good explanation on how the machine works.
AirSense Technical Manual
This machine has some good features that improve comfort especially when going to sleep. Here is how I set my machine up for comfort in the order they appear in the manual:
- Ramp Time: Auto
- Start Pressure: I have mine at 9 but since you are using a lower minimum I would suggest 6 cm
- EPR: On
- EPR Type: Ramp Only
- EPR Level: 3 cm
What this will do, if it is not already set up this way is start you out with a fixed 6 cm pressure on inhale and then the EPR will reduce it to 4 cm (machine minimum) on exhale to make breathing easier. When you fall asleep the EPR pressure reduction on exhale will stop, and the pressure will be put in automatic control mode to adjust to your events. I also use the ClimateLine heated hose and put it in auto too. For me this results in a pretty comfortable setup to go to sleep. Having EPR off when in the treatment mode generally lets the machine use less pressure to control events. Less pressure makes it easier for the mask to seal, and should also be more comfortable.
If you want to do a screen capture of the your daily report and post it here, I would be happy to comment on what I see. I am not a medical professional but do support myself with my machine as I have not sleep doctor to count on. I'm on my 30th version of machine setup, and I think I am pretty much there in what works for me. To capture the screen in SleepyHead just press F12 (on a PC). Then in file explorer just left click on the image file captured and drag it into the body of your post. You can tell a lot from where the pressure goes during the night and when the events occur.
What type of mask are you using? Generally most of the discomfort comes from the mask more than the machine settings. Are you having any issues with the mask?
Hope that helps some,