BTW, I want to write a book about loneliness. It seems to be one of the most painful of human conditions. I don't know any cures, but I've been researching. However, I have found very little about it in the medical literature, online or at amazon
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Slim
I dont know if youve read my post aboout it but the biggest cause of suicide in Australia is Post Divorce Trauma and its almost exclusively male suicides. A body count equal to the national road toll . So thats pain. How much of that is loneliness I really don't know.
Try the website DIDs. They may be useful for your book.
Also try the suicide studies department at Griffith University in Australia.