How can I reteach myself to sing?

Years ago I used to be an extraordinary singer, I was even involved in ICC (Indianapolis Children's Choir) my voice could do amazing things, but however, I got older and became a teenager and I joined a black metal band and all the screaming I did completely murdered my voice, I also dropped out of choir and singing lessons afraid of what others would think. A STUPID CHOICE. Now, I want to sing again like I used to but every time I try my voice cracks and feels dry, what can I do to repair my damaged voice?