The Killers: "All these things that I've done"
http://artists.letssingit.com/the-killers-lyrics-all-these-things-that-ive-done-7x1grc6
http://www.youtube.com/watch?v=jGfZ5ve17_M
It is my favorite and it really helped me through hard times, like the ones you're describing.. I could especially really relate to some parts of the lyrics like
"I wanna stand up, I wanna let go, you know , you know, NO YOU DON'T YOU DON'T" , because it's about how you feel that no one can really understand what you're going through, even if they say(or pretend) they do..
"Help me out, yeah you know you've got to help me out, don't you put me on the backburner, you know you've got to help me out..." because it described how bad I needed some help as soon as possible..
"I got soul, but I'm not a soldier" because I really felt that I was not so strong, as the others expected me to be..
---------------------------------------------------------------------------------------------------
Linkin Park: "Breaking the habit"
http://artists.letssingit.com/linkin-park-lyrics-breaking-the-habit-31jfnx3
http://www.youtube.com/watch?v=0zeqZPOzGn0&feature=related
-----------------------------------------------------------------------------------------------------
"I don't wanna be" by Gavin deGraw (One Tree Hill Theme Song)
http://www.metrolyrics.com/i-dont-wanna-be-lyrics-gavin-degraw.html
http://www.youtube.com/watch?v=c22TY2pvCzM&feature=related
-----------------------------------------------------------------------------------------------
Also
"This River Is Wild" by The Killers is good for what you requested(you can see lyrics AND MEANING-the one that makes sense to you-in the link I will put below)
Especially this part of the song:
"Or should I just get along with myself, I never did get along with everybody else, I've been trying hard to do what's right..."
http://www.songmeanings.net/songs/view/3530822107858626867/
http://www.youtube.com/watch?v=autqHy6JWk0&feature=related
link for "This River is Wild" with high sound quality:
http://www.youtube.com/watch?v=MApGwxjdQNk
PS: Don't feel sad:(
I really wish you feel better very soon. I really really wish you the best..!