Its making me look really pale and I'm not sure I like it, I really want my hair back to dark brown, its giving me a gothic look and I HATE it. I've been reading a few things and people have said prell works? Anyy advice on this from people who have used it on dyed black hair would be very vey helpful.

I want to find out how long it will take for my dark brown to come back
How much does prell original cost? And where can I find it. Morrisons?
I only dyed it yesterday after noon and I've heard it comes out more easily if its only just been dyed. PLEASE HELP! Thank you

It'll fade, but I doubt it will fade as fast as you want. Prell is just a strong (harsh) shampoo.

ColorFix can be used to remove it -- but then you have to re-dye the hair after you use it.