At work, you have to remind yourself that not everything rest completely on your shoulders. Stop putting so much pressure on yourself, because no one else is. Co-workers are there for a reason. They’re there to do their job and fulfill their roles on the team. If you need them to step it up a bit, then you should ask them to. Just do it face-to-face. An e-mail won’t convey the right tone and could ruffle some feathers.