Panic attack?
 

I'm sitting at my computer listening to music and looking around on RYL when suddenly the room feels too tight and I almost have trouble breathing. I have the craziest, but most frantic desire to throw open the window and run and keep running. I just starting sobbing out of nowhere and I feel scared and I just want to get away.

I am no professional, but from experience, it does sound like that could have been a panic attack. Try to keep a diary of each time that it happens, what happens and what you were doing when it came on. When you begin to feel like this, try to control your breating - breathe in for 7 seconds and out for 11 seconds and do this until you feel ok again.

I passed after about two minutes. It was the first time anything like that ever happened and I wasn't doing anything that could cause it, I don't think..

Any stresses or anxieties on your mind, even at the back of your mind?

It also sounds to me like a panic attack. I'm glad it didn't last too long. [although I know it can feel like forever when they're happening!]