Cocaine addiction! What would happen?

Ok it’s 03.40 in UK and I haven’t slept for 3 nights because I’ve been abusing cocaine. Now here’s the problem.
I’ve been using cocaine since November 2007 everyday.
I’m finding it really difficult to quit. I’ve been rehab and started again.
Before you say the company I keep, none of my friends smoke. It’s only me who smokes ad abuses drugs on a regular base.
I’m 24 male.
What can this cause to my body & brain?
How do I stop using cocaine?
What psychological impact would it have on me?
What would happen to my brain physically and mentally?
Only serious people answer please.
Thank you