Im looking for a bands similar to A forest of Stars, Oranssi Pazuzu and Nachtmystium, bands that are so atmospheric it puts you in a zone.

Well, they're not exactly 'psychedelic' (although they do have a certain weird, tripped out aspect to them) but Verdunkeln are definitely atmospheric enough for you. Both of their albums are fantastic, although I enjoy their second album more, and both have incredible atmospheres that will take you to another place. They have a huge, cavernous sound that just completely envelops you.

Check out Njiqahdda

You could give This Is Past a try. Also maybe The Mausoleums?

I'd say most of the stuff that was released under the 'True Sheffield Black Psychedelia' tag like Rraapcek, Black Vomit, Ice Bound Majesty - http://www.myspace.com/karaokevocaleliminator

As well as Tjolgtjar and Tyrant of Manchester.

Sigh's Imaginary Sonicscape album is excellent sighcadelic metal, although their entire discography is also psychadelic to a lesser extent, but all fantastic.

vediog svaor

You could try Ondo- Mahavishnu (more droney BM then psychedelic), Lyrinx (more depressive as well), Velvet Cacoon (if you can wade through the bullshit) and maybe Darkspace II in particular. All the Darkspace albums are very psychedelic, but that one is probably the most ambient and erratic of all three releases...