Will wegener's granulomatosis kill me if I don't get treatment?

Yes. Wegener's will not go away. It might take time but will ultimately cause severe lung and kidney problems, and death. Treatment can be very effective.
Yes. Wegener's is 100% fatal untreated, and it is not gentle or fast. Thankfully, the vast majority of people with wegener's get excellent results with today's treatments, and eventually the treated disease often remits.

Related Questions

Causes of wegeners granulomatosis and treatment?

Autoimmune disease. Like all autoimmune diseases, the cause is not really known, but likely a combination of genetic factors and environmental exposures (e.g., infections, chemicals, pollutants). Treatment depends on how severe disease it is. Typically steroids (e.g. Prednisone) and if severe, Cytoxan or rituxan (rituximab). If limited disease (just nasal/upper airway involvement), Methotrexate may be sufficient. Read more...