what just happend?

I am a person who can sleep anytime and anywhere. I have never had any problems unless Im very exited or nervous about something and then I usually wake up a couple of times the night before whatever it is is gonna happend. But last night was just a normal night. exept that when I went to bed around 11 I couldn't go to sleep. I watch tv between 12-1 to try to turn all the thoughts in my brain off.  Didn't help. Around 2.30 i just got on the computer to send a mail to a person that I coudln't stop thinking about just to get that off my mind. didn't get that far. Suddenly tears started to come. why? I dont really know. I decided that I wanted to talk to my mom so I called her work. She lives in sweden so it was morning there. forgot she's away for two days and I can't call her cell it's to expensive. That totally set me off. I started to cry harder then ever. Calmed down but couldn't stop fully. Tears rolling down my face. I started to breath funny. Like I was crying very hard even if I wasn't. Hyperventilated...maybe. My heart was racing. I couldn't stop. In all this I got the sense to get on here and somehow succeded so describe what I was feeling and asking what to do. Got the answer that I probobly had an anxitety attack.Now hours after I have a hard time accepting that. But i know it was it. I just don't understand why. Alot is going on but I have gone through much worse with out any attacks. ages 13-19 I was figthing depression and I still on some level are but point is I feel better now and now this happends? Yes I was alot happier a couple of months ago guess the dark thoughts are catching up with me. Anyway. I went to sleep about 4.00 am and got up at 6 something so got a little sleep. Just needed to write about it to get it out.