Thousands of people have had certain similar experiences and these need to be investigated.
Indeed they have (including many people who are not 'near death') and indeed they are being investigated using rigorous and robust scientific methods.
This is being done by qualified doctors and psychologists like Sam Parnia and Raymond Moody..... in the manner in which such phenomena can be best investigated.
Actually the best way to try to understand how these phenomena arise is to look at whether they are linked to particular neurological activities, and if so whether we can understand what physiological processes trigger that neurological activity and hence the experience of the phenomena. That work is ongoing and has demonstrated specific types on brain activity associated with experiencing phenomena of this type, and is associated with certain extreme physiological stress which occurs 'near death' linked to the process of dying, but also in a range of other major stress situations that have nothing to do with dying.
Your foregone conclusion that it has to be brain related hallucinations...
First, it isn't a foregone conclusion, it is an explanation based on evidence. Secondly I don't think the term hallucinations is really the right one and I would opine that you are using it in a pejorative manner to belittle the explanation. What I am talking about is neurological activities demonstrated to be associated with the phenomena experienced both by people close to death but in other circumstances that produce similarly extreme neurophysiological stress.
is the wrong conclusion.
Blimey now who is jumping to conclusions - you cannot simply ignore evidence just because it doesn't fit with your prejudices and foregone conclusions.
It is an attitude problem.
Indeed it is - a clear attitude problem that you demonstrate in sticking your fingers in your ears shouting 'I'm not listening, I'm not listening' when rigorous and robust evidence is placed before you that doesn't fit with your foregone conclusions. People with the right attitude base their conclusions on evidence, people with the wrong attitude start with a conclusion (regardless of any evidence for it) and ignore any evidence that doesn't fit their conclusion, while often clutching at straws and cherry picking the flimsiest of poor quality evidence that they see as supporting their prejudged conclusion.
No one has arrived at any definitive conclusions on this.
True - although there is some pretty strong evidence to support these phenomena being associated with extreme physiological stress and linked neurological activity.
It is equally possible that it is really an after-life experience.
It is not
equally possible as there is no evidence to support your assertion while there is ample evidence to support the scientific theory I've indicated.