Cocaine causes the vessels in the nose to shrink. This results in cartilage weakening and resorption. You should be off cocaine for months before the support is reconstructed with cartilage (probably ear). You could have a normal looking nose again, perhaps one even prettier than before the collapse.
Your nose is collapsing because the cartilaginous structure is melting away. It can definitely be reconstructed using ear and/or rib cartilage. However, such surgery would only be performed after your nose has stabilized and you have been off cocaine for an extended period of time.