When overwhelmed with a lot of work, sometimes it goes back to the principles of project management by first breaking down the work into manageable tasks. A second step would be to put the tasks in some form of order, to understand what must be done first before the other.
With this clarity of what must be done and in which order, it’s a matter of trusting your plan. While there may be surprises and unexpected delays along the way, work on the one task in front of you on your schedule.
Occasionally you have to look up to see that you’re on track. Then, redirect your focus to the task on hand. Before you know it, you’ll have completed that task, and the next, and then, in time, the entire work.