Intro
E|---------------------------------------------------------------
B|-----------------------------2------------------------------2--
G|-----------------------------2------------------------------2--
D|-----2-----2-----------------2------------2----2------------2--
A|-----2-----2-----------------0------------2----2------------0--
E|-----0-----0----3----3--------------------0----0---3--3--------
E|-------------------------------------------------------
B|--9----9----7---------------------0--------------0-----
G|--9----9----7---------------------6--------------5-----
D|--9----9----7---------------------7--------------7-----
A|--7----7----7---------------------7--------------7-----
E|--0----0----0---------------------0--------------0-----
Main riff 1
E|---------------------------------------------------
B|---------------------------------------------------
G|---------------------------------------------------
D|-----9------------11----11-----9----11-----9-------
A|-----7-------------7-----7-----7-----7-----7-------
E|---------------------------------------------------
E|---------------------------------------------------------
B|---------------------------------------------------------
G|---------------------------------------------------------
D|----9----------11-----11-----9---11----9-----9-----9-----
A|----7-----------7------7-----7----7----7-----7-----7-----
E|---------------------------------------------------------
[ Tab from: https://www.guitartabs.cc/tabs/l/led_zeppelin/sick_again_tab.html ]
Riff 2
E|------------------------------------------------
B|------------------------------------------------
G|---------------------5-----7------9-----9-------
D|---------------------5-----7------9-----9-------
A|----5----4------2----3-----5------7-----7-------
E|----3----2------0-------------------------------
Variation of main riff 1
E|----------------------------------------------------
B|----------------------------------------------------
G|-----------12----11-----9------11--------9----------
D|---9-------12----11-----9------11--------9----------
A|---7--------7-----7------7------7---------7---------
E|----------------------------------------------------
E|----------------------------------------------------------
B|----------------------------------------------------------
G|---------12-----11----------------------------------------
D|---------12-----11-----9------11----9-----9-----9---------
A|--9------7-------7-----7-------7----7-----7-----7---------
E|--7-------------------------------------------------------
Fill type thing
E|----------------------------------------
B|----------------------------------------
G|----------------3------3---2-------2----
D|----------------2------2---2-------2----
A|---2------2-----4------4---2---2---2----
E|---0------0--------------------0---0----
Riff 3
E|----------------------------------------------------------
B|----------------------------------------------------------
G|----------------------------------------------------------
D|---6-s-4-s-6-s-4------------------------------------------
A|-------------------4---2---4-----2------------------------
E|-------------------------------------------------3--4--0--
Chorus
E|------------------------------------------------------
B|----------4-----------4------------4-------------4----
G|-------4-----------4------------4-------------4-------
D|----4-----------4------------4-------------4----------
A|-2----------0-----------------------------------------
E|----------------------------4------------2------------