This is just a quick tab I did. I'll add a second version later and eventually a powertab version.
----------------------------------------------------------------------------
I'm So Sick - Flyleaf
----------------------------------------------------------------------------
Tabbed by: Geek716
Email: ungeekable@hotmail.com
Tuning: Dropped D
CHORUS
E|------------------------------------|
B|-----------------------------7-7-7--|
G|-----------------------------x-x-x--|
D|--3-0-3-0-3-/4-3--0-4-/6-6-0-4-4-4--|
A|--3-0-3-0-3-/4-3--0-4-/6-6-0--------|
D|--3-0-3-0-3-/4-3--0-4-/6-6-0--------|
[ Tab from: https://www.guitartabs.cc/tabs/f/flyleaf/im_so_sick_tab_ver_4.html ]
BUILD
|------------------------------------------------------------------|
|------------------------------------------------------------------|
|------------------------------------------------------------------|
|--8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-|
|--8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-|
|--8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-|
VERSE 1
|-8----7--10------14-----10-----------15--15--15--15--15----|
|----7--------10------5-----10-8--10------------------------|
|-----------------------------------------------------------|
|-----------------------------------------------------------|
|-----------------------------------------------------------|
|-----------------------------------------------------------|
VERSE 2
|-10-----10--8----7--10------14---14-14-14-14-14-14-14-14----|
|----10---------7--------10----------------------------------|
|------------------------------------------------------------|
|------------------------------------------------------------|
|------------------------------------------------------------|
|------------------------------------------------------------|