One of my former jobs was as a dispatcher...I used to say "my job is to put out little fires before they become big ones."
First thing I would do in a crisis--or a multiple crisis--is to think
triage:
--Which problems need urgent help now?
--Which problems can be stabilized with a minimum of fuss, just to tide them over for a little bit?
--Which problems can be left alone (or with a *very* simple fix)?
Second thing is to
communicate to everyone when (approximately) we'll be with them...at the same time we are setting up appropriate responses for the "need attention NOW" group...if time allows we address the (very simple) fixes for the third group;
Third, we
execute the plan(s) for the NOW group, monitor their progress, and start setting up for the second group.
It can be chaotic in a dispatch setting...lead, follow, or go get coffee for those who are...

Also, my ex used to say, "Now's a good time to panic!" I explained to her that there's never a good time...
before a crisis, one would look silly panicking...
during a crisis you MUST keep your wits about you...
after a crisis you'll again look silly panicking when there's nothing happening to panic about.
So, don't panic.