I read this book maybe 10-15 years ago and had it from my library. It follows a European man who is a restaurant cook/chef and devolves into a schizophrenic episode. It talks about him scratching his scalp, leaving his job and ending up picking vegetables as a day laborer in a zombie-like state. It doesn’t tell you that this is a schizophrenic episode until his sister finds him (I don’t remember how) and gets him into treatment, you’re just along for the ride from his perspective.

I’ve been trying to find this for a few years, now.