Can anyone recommend any post-hardcore bands?

Ehh Dir En Grey has high pitched at times but overall a good band

Killswitch Engage

All That Remains

Lamb of God

Atreyu

The Dillinger Escape Plan

Car Bomb

Mnemic

Chimaira

Thats all metalcore/mathcore i can listen to I prefer Death and Thrash metal

Slayer

Venom

Bathory

Death

Cannibal Corpse

Kreator

Exodus

Entombed

Nile

Carcass

Arch Enemy

Decapitated

God Dethroned

3 Inches of Blood

Quicksand

Fugazi

Fudge Tunnel

HUM

Jawbox

Jawbreaker

Far

Finch

Helmet

F.u.ck post-hardcore. Try grunge or alt-metal. Grunge would be Nirvana, Pearl Jam, Soundgarden, some Alice in Chains.

Alternative metal would be Jane's Addiction, Faith No More, some Alice in Chains, etc.

Post hardcore is just the demon child of pop-punk and deathcore.

Bullet For My Valentine...lol

Post Hardcore is a very vague description, and overall a poor name for a genre, but here are a few bands that tend to fall under the label:

Hoover

https://www.youtube.com/watch?v=gPtEii8FL0Y

Rodan

https://www.youtube.com/watch?v=RaQtK74sF5Q

Unwound

https://www.youtube.com/watch?v=Z5e-bE93ZGg

Lungfish

https://www.youtube.com/watch?v=Sqs5eW356c0

Shudder to Think

https://www.youtube.com/watch?v=zqux_XKWHnk

A Minor Forest (who tend to fall under the label "Math Rock" or "Post Rock" instead)

https://www.youtube.com/watch?v=IfV1pNKb0do

I recommend starting out with these bands and using last.fm or whichever music site of your choosing to spread out from there. Bands similar to these (and some of these bands themselves) fall under the labels "Noise Rock", "Slowcore", "Sadcore", "Math Rock", & "Post Rock" (though, Post Rock is a very diverse genre and only a few bands labeled Post Rock would also fall under the Post Hardcore label). Have fun!

Nomeansno

At the Drive-In

Unwound

GlassJAw

Drive Like Jehu

These Arms Are Snakes

Fugazi