My husband was recently diagnosed with Myasthenia Gravis. Soon after he started on medications , he had a crisis. Could not breathe, was put in ICU, intubated, given IVIG INFUSIONS . We thought this would make him better but he is no longer able to move around without getting very winded. His oxygen level goes way down. They tell him to go to ER, he won t, now can t do anything but sit in a chair. He is 73, has always been active,was a welder before retirement. Do you know what he can do to get better?