Depending on the drug, you can go cold turkey and not roll over and die.
I assure you, while weening may be the ideal option, no rehab center in the world would accept a paitent and tell them to use less cocaine perday. It just doesn't work like that.
There is a high risk for relapse no matter what way you take, but the fact that you 1. are taking a way, and 2. know the last way didnt work, so trying something else...shows a great strangth and determination.
The withdrawls suck...and they will. It's your bodys way of letting you know it is not pleased one bit...but it will go away. And once the physical goes away you will need to work on the psychological addiction as well. The psychological is going to be a lot harder, but you can do it.
You got this far! =)
Congrats on sobriety, don't hesitate to mail me if you ever need to vent through this. You're going to do great, and when you aren't barfing or doubled over in pain, try some meditation and grounding to help ease the pain. Also, find anything that doesn't remind you of it and work on it...be it a painting, crossword puzzles, clay scultping. Anything.