The treatment of stages of rigor fever?

Depends on cause: A fever is a high temperature and a rigor is a shaking chill. There's no disease called "rigor fever, " which is just a description of two symptoms. The treatment depends on the cause.

Treat the cause: Fever is a symptom and while it can be treated with antipyretics like acetaminophen, it is far more important to determine the cause of the fever and treat the cause, usually an infection.