So, my girlfriend broke up with me.

It was hard. It happened around two months ago, and she told me it was for my own good, as we were only fighting and and could not stop this fighting (that she always started for any stupid reason). After that she insisted that we kept seeing each other, so we kinda formed another relationship. We were together again, and crawling to a serious relationship once more.

Well, this time, and for the first time, she did something extremelly annoying using my name and I got angry and yelled at her. She started crying and after some time she told me that she wanted some time away from me. Without talking or seeing each other and etc.

She told me she'll still love me and after this we'll still have a chance to get back together but I don't know if I should believe in this. We were together for far more than 2 years and were always together, and this is breaking me!

I'm finding it difficult to have any pleasure, be it gaming, going to a friend's party or playing wargames. I'm being forced to live nightmares every time I sleep and the only two times I didn't have a nightmare about something horrible happening to her, I dreamed about something beautiful alongside her, and perhaps it was even worse.

I'm trying to remain strong and trust in her word, but it's hurting too bad and I feel like I'm losing ground...
Does anyone know what to do in this situation? I want to believe in it, I want to have her back, but this time is killing me and everything I once found pleasure in doing.

EDIT: Thanks for all the support, I can already breathe better. A lot of guys said some awesome things and it helped me a lot. Some even added me on steam and we chatted for a while, traded experiences. That's why I made this post here. You are all an awesome community that always made me laugh and now even helped me in some serious poop situation.
Thank you all, I won't forget it. Never. (AKA Giveaway coming soon)