Barb, I don't think you are an embarrassment to your family. They love you. Like Redrose said, you must use your oxygen. Please don't go without it :) I know that Bill and Nikita would be mortified if they knew how you were feeling. Those two have been rocks of support for you. There's no way you are an embarrassment. No way!
Lots of people have health issues and lots of them include oxygen machines. Is it possible that you might be taking too much notice in what others are thinking or seeing? I know for me, if I'm feeling "prednisone bloated" with that moon face, I assume people are staring at me and wondering, "Why does she look so weird?" But they really aren't staring at me. No one is even paying any attention. It's just me being hypersensitive!
I hope you go to Nikita's play and fully enjoy yourself. Just go and love every minute watching your darling daughter! Be good to you.
(((((hugs))))))
Ginny