I also struggle with loneliness though no longer the anxiety about being lonely.  I have gotten used to, and even enjoy, be out on my own, and for the most part am ok with it… and then the night comes and I wonder about meaning and purpose, wondering why I should wake in the morning.

I suspect loneliness very much tied to the experience of meaning and purpose and perhaps that is where some of the anxiety comes from.

Sorry that I don’t have any answers