This song has been difficult to find chords too, but hopefully this is a kick in 
the right direction!

The intro and first verse alternate between G and Gm.  Really not sure about the 
chorus, but the chords vaguely work I think.


Blood and rainbows taint the blue skies
Heart wide open, diamond eyes cry
White rabbit holes pull me inside

G      Eb
I fall deep
Bb                 D
You kill the pain, my opiate
G  Eb
5-HT
Bb                 D
Rush to the brain, my opiate

Rush to the brain
Rush to the brain

Clouds on oceans drifting in time
Mind blissed in circles and lines
White rabbit holes pull me inside

I fall deep
You kill the pain, my opiate
5-HT
Rush to the brain, my opiate

And it's ripping through my heart when you kiss me
Feel you beating in my heart and running through my veins
And it's ripping through my heart when you kiss me
Feel you beating in my heart and running through my veins
And it's ripping through my heart when you kiss me
Feel you beating in my heart and running

I fall deep
You kill the pain, my opiate
5-HT
Rush to the brain, my opiate