Hey guys, I kinda need help, 

Back in June we had a school trip in a beautiful small city in Bavaria Germany. We were there for a week, and it was absolutely great. Everywhere we’re mountains and the city was just beautiful, I had so much fun, and I was there with all my friends. It was the last school trip before our graduation so a few weeks after the trip, we got graduated and I started working. After my first week of working my girlfriend broke up with me (she was also there at the school trip) and since then nothing is the same. I saw my friends everyday at school and had so much contact and I also was with girlfriend 3-4 days a week. And now I have no one, my friends are all still at school and i am alone at work, and my girlfriend is gone too. Now to the big problem. Since I started working I can’t stop thinking about this school trip. I am 100% sure that this was absolutely the best week of my life. It was just great and it hurts so unbelievable bad that it will never be like that again. Everything was just great and I can’t stop thinking about it. And I am always getting extremely depressed when I Star thinking about it. It was the best week of my life and I just won’t get rid of the thought. Does anyone know what this is called or how I can make ist stop? 

Thanks for the help and sorry about my English it’s not my native language.