Don't mean to sound cheesy but some cheesy songs from high school times some times can really express what you really feel at a particular moment. A moment like this.
Lyrics of these might be a bit too simple. Tunes are not that catchy but they are very radio friendly. What sounded so meaningless during that time (at least for me) could turn out to be what I really feel now...

If you wonder what songs I'm referring to, hear me sing these. If you have the chance now:

Gil - If You Only Knew

Moffatts - I Miss You Like Crazy