This happens to the best of us. It has happened to all of us in the past and we were able to get control and get things done. We just had to focus and start doing things one at a time. It may seem overwhelming at the time, but looking back, it probably wasn't that bad. It's our reaction in situations like this that makes it so much worse. Instead of allowing the hopeless overwhelming feeling to take hold, slow down and do anything you can to help eliminate the stress. This has been floating around on Tumblr for a while and can help you get through these tough days:
Relax. We have all been there and we will all be there again. Being overwhelmed is not the end of the world and shouldn't ruin your day. Put in the work, focus on the priorities and get as much done as you can. Once you take some deep breaths and slow down that overactive mind, things will become a little clearer and you can work your way out of the pile. Even on the worst days, when the world is plotting against you, remember tomorrow will be a new day.