if you have children or pets, make sure they are cared for. i know this seems obvious, but in these first days, you are in survival mode. and sometimes things even really important things get forgotten.
make sure someone calls your work and lets them know if they do not already know. make sure someone calls your family if they do not already know.
there may be people around you trying to help, so tell them what you need if you have the faintest idea what that is-- if you need them to make calls for you, ask them. if you need space and silence, say so. if you need a movie, a hug, a pizza, say so. everyone feels powerless in this situation. everyone. people are truly wanting to help. if you do not know what you need or want, say so. or say you want water. or tea. or something.
eat anyway. eat even if you cannot imagine eating. eat something that matters-- something with calories. peanut butter. chocolate. cheese. if you cannot swallow past the lump, try a milkshake, a smoothie, a yogurt.
I suggest you do not listen to music that you love, you may forever associate it with this time. so if you listen to music, branch out. try something new.