"We'll Be Here (When You're Gone)" by Goo Goo Dolls got me through - I know this sounds totally stupid - Harry Potter ending. :/
"Defy Gravity" from the Wicked OBC soundtrack got me through...a lot of things.
"Even Angels Fall" by Jessica Riddle got me through my Junior year (a bad year :/)
"Get Over It" by OK Go helps me get over just about all the small stuff.
And here's the cheesy one:
"Kelsey" by Metro Station gets me through times when I miss my girlfriend, Kelsey. c:
Be who you are and say what you feel because those who mind, don't matter and those who matter, don't mind
~Dr. Seuss