Check this guide and bottom video(last video really starts at 2:00 minutes)
loveforum.net/the-relationship-news-and-articles/85672-guide-deal-breakup.html
Check also the good videos I looked up for you
Real social dynamics - Julien
youtube.com/watch?v=GdnYedTpToA
youtube.com/watch?v=KriZHsiiYPg
How to deal with a bad breakup
youtube.com/watch?v=K8Exlo4E5v8
What more can you do is visit psihotherapist or get counseling for you problem. Talking with someone proffesional or friend will help. You have to let this out of your system and get advice in real world. So it will be more effective help for you.
I suggest you visit gym. The sport is good medicine as well.
Doubt kills more dreams than failure ever will