Hiyaa!! Yeah, so I posted the chords to this song a while ago...they were WRONG. 
This version is MUCH BETTER. Listen to the song for the strumming pattern.

Capo 2

         F                    Am
I'm so stubborn, it's how I got here
        F               Dm
So alone, feels like forever
         F                     Am
Wanna swim away and breath the open air
                 F    C             Dm
But I feel so afraid, then I hear you say

     Am           G
Hang on when the water is rising
     F
Hang on when the waves are crashing
     Am    G               F
Hang on, just don't ever let go

        F                 Am
I'm so hungry, how can I stay here?
F                    Dm
Starving for what I hold so dear
        F                  Am             F
Like a hurricane it takes everything from me
    C              Dm
Wake me from this dream

     Am           G
Hang on when the water is rising
     F
Hang on when the waves are crashing
     Am   G               F
Hang on, just don't ever let go

     Am           G
Hang on when you're barely breathing
     F
Hang on when your heart's still beating
     Am   G                 F...
Hang on, just don't ever let go

F           Am
Three days, thirty years
F            Am
So hopeless, doesn't matter
F          Am                  C
Don't say it's too late if you blink your eyes
    Dm....             Dm...      G
The sun is rising, the sun is rising,

Am G F
Oh...

     Am           G
Hang on when the water is rising
     F
Hang on when the waves are crashing
     Am  G                   F
Hang on, just don't ever let go

     Am              G
Hang on when you're barely breathing
     F
Hang on when your heart's still beating
     Am  G                    F....F...
Hang on, just don't ever let go

F...