The depression doesn't help, but this sounds more like stress. Don't know how much it will help, as I don't suffer from depressin, but occasionally I'll get myself into a rut like that, and I found a few things that help.
Sleep at night. No more late nights, give your brain a rest before bed. Limit your caffeine to the morning - and no naps either. Sleep a full 8 hours, and willingly go to bed early enough that you have an extra hour of leeway in the morning. You'll feel tired until your body adjusts, but it will.
Get some cardio in - go for a run, ride a bike, or swim. Do something to get your heart rate up. Your body will naturally reward you, and will help calm you down mentally. Pay attention to your body, and add more cardio as you can tolerate it.
Keep a day-to-day list of things that you have to accomplish, and update it as part of your morning routine. I would recommend the Bullet Journal method, since that's been working for me. This will help you keep on track and see what you've actually accomplished.
Break down tasks that seem too daunting into smaller portions. Something that may sound simple like deploying an application can be overwhelming until it's broken down into smaller steps. Smaller steps also lead to more frequent wins, which will act as encouragement since you'll get to see progress.
And finally, don't expect to get so many things done per day. Focus on one or two things and work on them. If you add more than that, you'll just compound your stress which will turn into a vicious cycle because you'll constantly feel behind on your work.
Good luck, you're in a spot that plenty of people have been in, including myself, but even if this isn't it, there /is/ a way out.