What happens when you die of an aortic aneurysm?

An aneurism is a weak spot in a blood vessel. In the case of your grandmother, ( Please accept my sincerest sympathy on your loss), because of the location (the aorta is a major blood vessel), she would've been alive one second, gone the next. She did not suffer, death was instantaneous for her. I'm not a pathologist or anything, just someone with above average knowledge of medical things. (Medicine has long fascinated me.) if you'd like someone to talk to, I am here. May I also suggest that if you have a hospice in your area, you should seriously think about seeing them for bereavement counseling. They understand what happens to family members after a death, be it unexpected or expected. They can give you materials to help you cope better. I also suggest (sorry for all the suggestions, they just occur to me randomly, lol) that you look up Elisabeth Kübler-Ross' "Twelve Stages of Grief," and "On Death and Dying." *hug*!