1% Hydrocortisone cream is what my yahoo adrenal group says to keep handy for these kinds of situations if you cannot obtain the injections.
You can find the cream at any walmart or walgreens. 1 ml equals 10 mg supposedly, but of course you have to learn to dose it because everyone's different.
I would take at double of what you normally take with cream. During a crisis use a vieny area like the wrists for quicker absorption.