I'm sorry. Talk to friends, cry it out and eventually with time it gets better.
You need to get out of the house (with a friend) during these first few days to a week, so your mind does not go bonkers and over whelm you...... (((hugs)))
So you two haven't talked for one day, that's no big deal. When in a relationship it's impossible to always be together.
Time! and probably only time will solve it. weather or not your to be back together or not, that answer will show itself eventually. Unfortunatly your in the bad part of it right now. "The first few days"