This is from TBBT Season 7 Episode 6, and this is the song that Howard sings to 
Bernadette in the hospital. I think this is so adorable, and i hope it is correct, and you 
enjoy! :)

Intro: C    F
C                      F            C
If I didn’t have you, life would be blue
F             C               D
I’d be Doctor Who without the TARDIS
F                  Am      A                F
A candle without a wick, a Watson without a Crick
F                C                  A
I’d be one of my outfits without a dick-ey
F       G
I’d be cheese without the mac,
Am               D
Jobs without the Wozniak
F------------
I’d be solving exponential equations that use bases not found on your
                                     G
calculator, making it much harder to crack
             F           G       Am              D
I’d be an atom without a bomb, a dot without the com
        F              G            C
And I’d probably still live with my mom
                      F             G              C
(All, echo: And he’d probably still live with his mom)
F             G               Am
Ever since I met you, you’ve turned my world around
F       G                  F        Am
You’ve supported all my dreams and all my hopes
F        G                         Am
You’re like Uranium-235 and I’m Uranium-238,
D                   G
Almost inseparable isotopes
    F            Am                        D
I couldn’t have imagined how good my life would get
           F          G          C
From the moment that I met you, Bernadette


      F                C      F      C
If I didn’t have you, life would be dreary
F                    C            D
I’d be string theory without any string
        F                    G
I’d be binary code without a one,
Am
A cathode ray tube without an electron gun
F                                 G                     Am
I’d be ‘Firefly’, ‘Buffy,’ and ‘Avengers’ without Joss Whedon
F                         G
I’d speak a lot more Klingon,
(AND THEN IN KLINGON SOMETHING THAT SOUNDS LIKE:)
G        C                  D
Kalocht mechht kaccht jujch faaarm....
              F                G              C
All: And he’d definitely still live with his mom
F               G             Am
Ever since I met you, you’ve turned my world around
F                             Am
You’re my best friend and my lover
F                            G        Am
We’re like changing electric and magnetic fields;
D               G          Em
you can’t have one, without the other
    F              G          Am                D
I couldn’t have imagined how good my life would get
         F              G           C
From the moment that I met you, Bernadette
             F               G           Am               D
All: Oh, we couldn’t have imagined, how good our lives would get
          F              G           C
From the moment that we met you, Bernadette