Also could cover the anthropic principle and the properties of the universe that had to be exactly right. You can either explain this with a multiverse or a god. Either 'solution' is ridiculous and yet we have loads of people reporting seeing an actual god while dead... I'll side with a god.
The anthropic principle says that you wouldn't exist to observe the physical constants of the universe unless those constants allowed for your existence. You don't need either a multiverse or a god to explain it. The constants just are. If the constants were different, we couldn't say, "Hey, those constants don't allow for life," because we wouldn't have ever existed in the first place.
Near-death experiences are caused by chemical reactions in the brain. I've had drug experiences where I swore I had entered a totally different reality unconnected to anything on Earth. Yeah, it was the drugs.
Better study up more. Not only is 'the constants just are' a completely unscientific statement but it also doesn't offer an explanation for observable data. Its like saying that when a squad of ten sharp shooters lined up to shoot a man sentenced to death, and they all missed, that they obviously missed because if they hadn't the prisoner wouldn't be around to know. No explanation. And yes, you do need to posit one or the other or something new if you have a bright idea of explaining it.
Also, read up on near death experiences deeper than a google search. If it was caused by chemical reactions in the brain there would have to be a constant environment which brings that about, not to mention we would be capable of inducing it. Not only can we not do that, but it still wouldn't explain the many cases of verifiable information observed by the brain dead individual.