I had an at home test and stopped breathing 15 times/hour. I’m set to 5-15 pressure…as I understand it starts at 5 and ramps its self up if it detects that I need more. Trying this thing out before I dare to try to sleep with it, but it’s causing me horrible feelings that I’m smothering as if I’m breathing stale air in a brown paper bag. It makes me want to take deep breaths to get a refreshing breath, and it makes the machine sound like vacuum cleaner. Is this normal or am I missing something? I’m trying it at first without the water attachment, but this feels this way immediately.