Why are you asking me? I am a Freaking Out machine... I'm much more qualified to show you How To Freak Out. So, let's begin.
Step One: Blow everything out of proportion.
For example: Move a door 6 inches?
It is also wise to react to things by getting your heart to race, your hands to shake, and more of that crying thing.
Step Two: Overanalyze everything for no good reason.
For example: If your boyfriend says, "I like cheese", you should think CHEESE?!? He likes CHEESE? But what about me? Doesn't he like me? What's wrong with me? Does he think I'm fat? Is he saying I should eat less cheese? OH MY GAWD! HE THINKS I'M FAT!
Step Three: Become a martyr.
Sleep a lot, eat a little, look gloomy, and most importantly, end all your conversations with "... Oh, but don't worry about me."
Step Four: Drink.
Step Five: Start "running" around the reservoir in the park every morning.
This may seem odd to add to a lesson on How To Freak Out, but trust me. There are very scary looking bushes around the reservoir, and you can go "GAAAAAAARRUGGH!" every time you approach one so you can startle the boogeymen, and you'll end up looking like a crazy person.
And looking crazy is the most important part of Freaking Out.