Life after death.......?

I know that this question gets asked a lot but trust me i have a reason to ask...so i was watching that show "Through the wormhole" the other night and it's topic was whether or not there was life after death...before i make my claim i just wanted to say that i don't believe in either an afterlife or a cease of existence, because i truly would rather live my life than worry about that..I'm just a very open minded person... while i was watching the show they (one of the scientists) was explaining something that just didn't really sound right to me..he said that the consciousness is located in the brain and that the only reason people have NDEs is because of the lack of oxygen in the brain, which in turns creates these hallucinations that people "mistake" as a glimpse of death...well they say the brain can only survive for 5 minutes after the heart stops before the brain dies too..but i saw this one interview with a woman who had survived a heart attack and her brain had been starved of oxygen for well over 5 min and she had still survived..the doctors said she wasn't supposed to come back because her brain had been gone for so long..so do you think this was just some type of luck or does it actually hint to an afterlife? and my other thought was how the scientists say that NDEs are all the same which explains why they can't be real...wait a minute here. if people were all having "hallucinations", well then wouldn't they all be different? because NDEs usually report the same things happening in most cases, surely that doesn't mean that everyone's brains is perceiving the same exact hallucination as the other..they must all be the same for some reason..i guess you can look at it either way, of course. I'm no neuroscientist, believe me. so if anyone can (scientifically) dispute my claims I'd be more than happy to hear because I'm just a really curious person thats all...sometimes i just like to yze things and what not..well thanks in advance :)