Is there a mini bipap (like transcend)

I have no idea what the difference between ventilator and a bipap is tbh.

I really don’t know if PS 3 is good enough. I think I’ll contact my doc and some company’s if I can try a machine with PS 3.

I failed to consider yesterday that your current night time/sleep setup may be inadequate. With adequate ventilation support/muscle rest at night, many people actually notice improved functioning during the day. What I'm trying to say is: you may not necessarily require daytime ventilation as of yet.

Do you see a sleep doctor who specializes in pulmonology or neuromuscular disease?

For someone with muscle weakness, a pressure support of 3 is very low...basically useless in terms of ventilation/muscle rest. CPAP alone does not provide ventilation support (directly, anyway). Even for OSA patients, usually you start Bi-level titration with a PS of 4. Any bi-level machine can provide pressure support.

For NMD muscle weakness with normal lungs, I typically see pressures of IPAP 12 - 16cm H2O / EPAP 4cm H2O (assuming no sleep apnea). Usually you start low and increase PS slowly to get used to it.

Have you been to a sleep lab? Ideally if you're physically able to sleep in the lab, it would be beneficial for you to sleep a night getting your O2 saturation and CO2 levels recorded to see what's happening.

A ventilator is basically a bipap on steroids...more therapy modes, batteries, alarms, portability in terms of getting around with assisted ventilation, etc.