There's no easy way LMN - you have to stop drinking.
One day at a time, fight through the cravings.
It's simple - but never easy.
I dunno how much you've been drinking over the three weeks but, regardless of who knows or not, I think anyone who thinks they need to taper should be responsible - they should front up and see a doctor.
Please do that if you think that going cold turkey is going to be a risk for you.
D