You can either use full chords or just power chords, but in the case of Fm,
this chord is needed. I think this tab is correct, enjoy it.
Chords used:C-F-Fm-G.

Intro C-G-F-C-F-Fm-C

               G
I'm rotting inside
     F             C 
My flesh turns to dust
  F               Fm         C
Whisper, are you dying in my ear?
                G 
I'm so sick to death
 F            C     
Tumors in my head
  F               Fm         C
Whisper, are you dying in my ear?

Bridge
  F            C    
Black rose of death
F              C
In my fist I clutch
  F              C
Thorns shred my finger tips
F                 G
And drips toxic blood

2nd Verse (Same chords as first)
Kiss me one last time
Wipe off my sweat
Whisper,are you dying in my ear?
As my bones they rust
20lbs of trust
Whisper, are you dying in my ear?

Bridge (Same chords)
Black rose of death
In my fast like lunch
Thorns shred my finger tips
And drips toxic blood

3rd verse (Same chords)
I'm rotting inside
My flesh turns to dust
Whisper,are you dying in my ear?
Kiss me one last time
Wipe off my sweat
  F               Fm         C
Whisper, are you dying in my ear?
  F               Fm         C    Fm - C
Whisper, are you dying in my ear?