Hi peaches and cream,
I'm obviously very sorry for what's happened. It is a rare but traumatizing complication.
In general, you need to first let the area heal, and after that you can consider any of a range of reconstructive techniques. Healing the wound is done with a combination of dressings, wound care and, rarely, the use of some devices. You should, of course, remain under the care of your plastic surgeon throughout this entire process but particularly as the wound is healing. This will be the time that you need the most support, from every standpoint.
Once the region is healed there will be a choice of things that can be done. These include nipple and areolar grafts, tattooing, etc. You should again work closely with your surgeon on this. If you have any questions, at any point, you should not hesitate to obtain other opinions before you proceed.
Again, I'm sorry for your course thus far; hopefully, you will wind up with a result you'll be happy with.
Dr. E