Why is my septum thin and flimsy, skin loosening shapeless, whistling when I breath? (Photo)

A year ago I got mugged resulting in a broken nose. I couldnt breathe out of one side because there was no bone structure to keep the loose flesh from sucking back into the nasal cavity The septum is thin and flimsy, my nose skin is loose with no shape to it, theres a whistling when I breathe that shifts for one nostril to the other(I think because the septum is flimsy)and one of the nostrils has a dark spot on it, it feels like the cartilage has broken down it isn't as taught as the other side