I can recommend Lars Svendsen, A Philosophy of Loneliness, in which he examines loneliness and its positive companion, solitude, in detail. Not a self-help boo

I can recommend Lars Svendsen, A Philosophy of Loneliness, in which he examines loneliness and its positive companion, solitude, in detail. Not a self-help book, but a view on loneliness from both an empirical and philosophical perspective.