Will orbital fracture kill me if I don't get treatment?

No but other issues. It won't kill you to not repair an orbit fracture but you could have other problems. Unrepaired orbit fractures can lead to permanent double vision or cause the eye to sink down or back into the head. All eye socket fractures should be carefully evaluated by an eye doctor and a facial surgeon who does facial fracture repairs.
Very possible. And it won't be pleasant. It can also permanently adversely affect your vision. Why aren't you getting treatment?