Well, I have never myself been in a similar situation, but I do know it is difficult to go through your parents splitting up (Especially cause I was the cause of mine splitting up, Don't ask, long, depressing story) but I eventually got through it. I do hope that you will be able to get through this and come out a stronger person.
Another peace of advise that I'd give to you is try and get a letter from a loved one and each day look at that letter and realize that there are people out there that make life worth living, that even if you have a bad day, that you know that they deep down love you.