If your machine has changed the purity of your oxygen, which is what this sounds like, try change the filters first.
You would be surprised how much difference it can make.
I think there are two on the input side (one course for hair and stuff, the other is a fine pore kind of filter) and yet another one on the output side.
The output one is a biologic filter and keeps the machine from infecting sick patients with microbes.
Good luck.
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