Did she give you any reasons? You may do well to reflect on what went wrong, and learn not to repeat those mistakes. If it was all her, then she wasn't good enough for you. Take a few days downtime, ingest something mind-altering if you like, have some random sex. Then keep calm and carry on. It gets easier with time, trust me. Also, don't rule out the possibility that she may just want a short break to clear her head.
There's no shame in having a good ol' bawl, either. Not the sexiest of things to do, but it helps.
I hope it all goes well for you. Women are as mad as a hatful of badgers, sometimes.