I have pondered this question for MANY years and read o lot of literature regarding possible theories.
Anthony Peake is an avid researcher and uses the concepts of quantum physics to argue that at the point of death, we don't die but get transported to another reality where we live as us again but with a different set of circumstances i.e. a reality where you're not encumbered with suicidal ideation. He makes quite a strong point with the double-slit experiment. So, in a nutshell, the world only exists because we perceive it with our consciousness. without us, there would be nothing. According to him, this explains the de ja vu phenomenon. He has many fascinating books, but my favourites are cheating the ferryman and the hidden universe.
Another researcher is Michael Newton. He was a hypnotist who helped people with addictions. During his sessions he noticed that some of his clients would descirbe 'between lives' scenarios. This intrigued him and he delved a little deeper. For thirty years he dedicated his practice to 'mapping out the afterlife'. He has regressed thousands, and all have described the same place.
Dr Peter Fenwick has researched the end-of-life phenomena and has found striking similarities in those who experience unusual events. Dr Bruce Greyson is another professional who has collaborated with Dr Fenwick.
Then there's evidence of those who can astral project i.e. the ability to leave your body whilst in a state of relaxation, and then travel to where you wish. the CIA invested heavily in researching this phenomenon because as usual, they wanted to weaponise it and use it as a reconnaissance tool. the CIA pretty much proved that it's real and you can find the document for that here:
https://www.cia.gov/readingroom/docs/CIA-RDP96-00788R001700210016-5.pdf
the cia document above mentions the work of the 'monroe institure'. Robert monroe was an enigma at out of body travel and he wrote many books. One of my favourites is far journeys. The Robert Monroe Institute is still operational to this day. One of its trainers is a guy named william buhlman. He too has travelled many times out of body. He's written many books and has a private facebook page which Im a member of.
So....there we have it! I understand that the thought of carrying on is terrifying given we're all suffering from debilitating depression, anxieties and horrible ideations, BUT, this is 3d, our minds are far more expansive in the afterlife. According to a lot of the researchers we are nothing more than spirit wearing meat coats. we shed it upon death and become free again. So rather than fearing it, I would encourage you to embrace it. Furthermore, I would suggest that you get in touch with William Buhlmann if you have any worries, he is very accommodating. I too am here if you ever need a chat.
Much love to you