Im looking for something that Is like Carach Angren but minus the black metal just the symphonic stuff but still intense and giving a dreadful atmosphere. Dark eerie Classical works too.

http://www.youtube.com/watch?v=DUmq1cpcglQ

not sure if you meant actual classic music, but this melody sounds like someone going insane to me.

Alexander Nevsky by Prokofiev has some very disturbing moments. But, as classical pieces go, it has also the opposite.

Well Im just looking for music using classical instruments but this song, It has quite an interesting sound to its like you can feel alot of emotion in this artists music.

Surely, you know of this famous Bach piece?: http://www.youtube.com/watch?v=OYpMxYDLybM

Scott Walker's "The Drift", certainly, although it's more just avant-garde with classical instrumentation. As a rule of thumb I'm not easily scared by things, especially never by music, but this is the one exception:

http://www.youtube.com/watch?v=AuHfAqz3TFY

Best listened to with the lights off and with headphones.

This is an absurdly dark piece by Arnold Schoenberg, absolute tonal nihilism if ever there was such a thing.
http://www.youtube.com/watch?v=vQDxn_LMCfQ

This, thematically, doesn't get any darker: translated, the title is "Songs on the Death of Children" by Mahler
http://www.youtube.com/watch?v=u7tBocjEYnc

Classical music gets darkest, I think, when you step into the post-war avant-garde composers. This era of classical music is often used in horror flicks. For example, creepiest of the creepy, Krzyzstof Penderecki's "The Dream of Jacob"
http://www.youtube.com/watch?v=tOTQ9TVkG98

György Ligeti: "Lux Aeterna"
http://www.youtube.com/watch?v=-iVYu5lyX5M

Krzysztof Penderecki: "Threnody from the Victims of Hiroshima"
http://www.youtube.com/watch?v=GOnC5X8rWi0

Béla Bartók: Music for Strings, Percussion and Celesta, I
http://www.youtube.com/watch?v=WNw_2auj1RQ
(note: this guy isn't post-war, just for technical clarity)

Hope some of this is what you're looking for

Iannis Xenakis has some pretty unsettling stuff.
http://www.youtube.com/watch?v=SZazYFchLRI

Richard Strauss' Elektra if you like opera at all.
http://www.youtube.com/watch?v=qb-9mWwxoPc

Gustav Holst's Mars The Bringer Of War
http://www.youtube.com/watch?v=L0bcRCCg01I

Goatcraft - All For Naught
http://www.youtube.com/watch?v=oZ77BoctBYo

Giya Kancheli - Mourned By The Wind
http://www.youtube.com/watch?v=Su7jePS0 ... D8C15BEB82