There are four or five poems I read almost every day as a sort of cathartic ritual

Wonderful! I'd love to hear about them. I also have a few go-to poems for those days I feel unbalanced. The two I've probably digested the most would be "If--" by Rudyard Kipling, and "Desiderata" by Max Ehrmann. They're not exactly hidden gems, and I've even seen them floated around HN from time to time, but man do they work.

http://www.cs.columbia.edu/~gongsu/desiderata_textonly.html

http://www.kipling.org.uk/poems_if.htm