Do you know are all brain aneurysm's fatal?

No. The majority can be handled by medical therapy, and the bulk of the remaining can be treated by interventional techniques or surgery. While a rupture of a brain aneurysm can be fatal, a large number of these can handled medically or interventionally.
No. There are multiple internet sites providing information regarding brain aneurysms. Consider http://www.Webmd.Com/brain/tc/brain-aneurysm-topic-overview, http://www.Bafound.Org/brain-aneurysm-basics, or http://brainaneurysm.Com.