@Rafacub:
sad to hear that the masks didn't work for you. I have been doing well with a F&P Eson 2 Nasal mask. Which is a game changer compared to many other masks.
There are plenty of options around, and yes it's an absolute pain in the a.. to get them to give you the good options. I was just lucky with my sleep doctor.
Further it can also be crucial to get the proper machine with the proper hose and stuff.
Unfortunately there is no one fits all solution, but there are plenty of options around.
Of course there are also other options like implants and operations. I'll first try to loose weight until going for an operation.
Wish you all the best!