Hey, hey... I am the man of the answers here!
I just went trugh the same and it was even worse. Now I am going to give you the basic answers and then the explanations of everything about that kind of tehpression and actually depresion in general.
1. Keep your mind active and distracted, listen to other kind of music, put in a box all the memories you have from her. Do no seat there wondering, even is going to happen a lot just do not waiste your time in to something that is going to hurt you. It doesn't mean the relationship was bad or she is bad, no. Everything between the two of you was ok but you are now working on your health.
2. Eat proteins and things that give you energy. In the morning drink a coffee and something sweet and you will see how your mood is going to improve. During lunch eat pasta. Meat does not give you energy but you can eat it too as a side. At night you can eat meat and a salad and if possible drink a gatorade befor going to bed. Macdonaldas is very bad for the mood and do not ask me why, if you are going to a fast food place do not eat onions. Then drink milk, gatorade and juices but keep the sodas on a side beacsue they are not natural at all and cause anxiety.
3. Excersise, run and do some work out, it is going to be anoying because you are not used to but is a good way to start to manage the energy in your body. Do not spend time in the computer and if you feel a bit down rent a movie or watch tv for a moment. You can visit your friends and stuff but to add more new memories to your mind while pushing away the old ones.
The reason of these is that our mind work like this: When you have a memory and you remember it over and over again is like walking between bushes, after a while you are going to have a road because you have been there so many times. It is a natural process. What you have to do now is to start creating another paths related with new things, a hobbie or something. To date some one else work too.
Then, the brain need energy and that energy manage your moods. If you do not eat properly you will loose the energy necessary to be more active and creative. When you are not active you will fall (as a defolt) in your past memories making you feel depressed.
Now, depending how much effor you put in to yourself yo can recover in 2 weeks or 6 months.
On the other hand the isolation here in the UNITE STATES does not help at all. My biggest depresion was last year after moving to New York and I survived. I was bi-polar and was caused by a relationship I had, trust me I never though the human body could host such terrible feelings and sensations. That is why I am telling you all this because I managed to get out together with a friend who was a psicologist.
What you can do too is go to church and listen. There is something very importnat you have to know and is that somebody already died for you, for you to be free, and the father of that person gave you something incredible important that is "free will", that mena that you are completly free of choosing your way and the rest of the people are too. We are not chained to anything. So, do not waste your time suffering because no body cares and you are totally free and allowed to be happy.
As a las note: learn from your process for you to recover faster next time and teach some other people about it.
Good luck
