you need to focus on a single thing, finish it and move on to the next. It's easier said than done because sometimes one thing might take too long and you might feel the need to drop it and attend to another task that's more urgent.
But at the end of the day, once you finish a task, however small, you'll feel better and have more mental energy to deal with the rest.
Also lying in the bed and worrying about what to do is less useful than getting into a more awake posture (sitting at a desk) and dealing with an issue. That said give yourself frequent breaks (reading HN) but cap it so you don't spend all your day reading news.
Don't forget daily exposure to sunlight. It regulates your clock and mood.