bad advice: drink heavily, and alone. You'll become overly emotional and would rather not let anyone see you. Days will go by without you noticing and sooner or later she'll become someone you used to know.

other advice: it's really too soon to give any decent advice. Since the brake-up is pretty recent, it's okay to think about it more frequently. Just wait a while, depending on how long the relationship lasted. Distract yourself with other things and spend more time with friends.