I tripped over a book on using yogic mantras to help with anxiety and depression. So I said OM a lot this morning, and maybe that's exactly what I needed to get going again (as well as three days of rest and downtime).
I once upon a time, back in California, meditated and chanted OM, so I dove in and played with harmonies, with going silent, with going up an octave or two, and even whispering. You can do it all. Or just repeat internally, soundlessly.
The OM on YouTube (you don't need to read the book): The Cosmic AUM
The book that led me there: Mantra Meditation: An Alternative Treatment For Anxiety And Depression