Any recommendations for literature that deals with solitude?

I'm working overseas and my job doesn't require a lot of socialization, consequently I can go a week without even seeing another person (let alone interacting or carrying on a conversation). I've been alternating between feeling incredibly depressed/romantic about it lately, but in either mood the catharsis from reading has been very powerful

Nietzche, Rousseau's Les Rêveries and the Tao te Jing have been my standard rotation for about a month now but I'm looking for something new that might scratch the same itch

Any recommendations?

Yes, I've checked the sticky