Hi!
Here´s our experience of extra oxygen:
I am the mother of Louise, now 10 years of age and 3˝ years post surgery, performed in Sweden.
To deal with the symptoms on moyamoya while waiting for surgery she was given "Home oxygen" and kept it until about one year after surgery. There are no mm-experts in Sweden but they agreed on this following my suggestion, but only 2 liters for 5-15 minutes and it always worked for her. For a few months i carried around these tubes wherever she went. I was told to be sure she kept her breathing normal to keep the balance between O2 and CO2.
These oxygen tubes was a great help and comfort to us but finally she agreed on returning them to the healthcare about one year ago. She didn´t use any extra oxygen in a long time but felt more secure knowing they were in the house, just in case.....
She still has mild symtoms fairly regularly but prefers to deal with them in other ways.
Thats our story about Home oxygen hope it helps someone!

Take care and have a fantastic gettogether in Orlando in a few weeks, wish we could be there!!!!!

Annica and Louise