Well, I'm not a nurse, but I'll try to help.

If your MG is good, worse, or nearing a crisis, breathing is always worse while sleeping because muscles are weaker while sleeping.

Respiratory distress can occur during the night and day if you are in an exacerbation or crisis.

If your breathing is that bad, you NEED to dial 911. If you're going into an MG crisis, time is of the essence. There's no way to know how quickly it will get worse or how severely.

The oxygen question depends upon what your O2 and/or arterial blood gas shows.

The best place for you right now is in a hospital. It doesn't matter if you don't have a diagnosis. Tell them MG is suspected. They can run tests and give you supportive care!!!

I hope you'll be okay. Please get some help.

Annie