I think the worst part about being clinically depressed is how it feels impossible to do a little bit for a few days at a time, and then all my context/momentum/enthusiasm burns up by the time I come back to a project.
Turns out I had ADHD and Vyvanse changed my life. I did stop medicating after one year because it wasn't easy on the body (accelerated hearth rate) but medication gave the kickstart necessary to drag my ass through dark times and have impetus. Understanding my problem allowed me to manage it.