Oxygen on Air Plane

Today I found out that my doctor says I have to have oxgyen on my plane ride.  The doctors put into over drive to get this all put together.   I am overwhelmed with it all.  My  thinks it's not needed and I am making a big deal out of it.  I know I am not because the doctor, nurse and respiratory rehab have done all the work.  They were the ones that got the ball rolling.   Tomorrow I have to go pick up oxygen concentrator and how to use it.