I've provided a link to some helpful information regarding 'Abdominal Aortic Aneurysm'. Considering the information you shared about your recent diagnosis a cardiac surgeon, one who specializes in disease of the aorta, should be consulted immediately. There are too many variables to consider and each person must be evaluated individually however a 6cm AAA does sound extremely high risk. Again, only a cardiac surgeon is qualified to give you the best advice and treatment plan.
https://my.clevelandclinic.org/health/diseases/7153-abdominal-aortic-aneurysm