What to do if you are overloaded with work

Management does not always know about your workload

The head of your department or department will not be able to help if he does not know about the existence of a problem. A common mistake is to be sure that the bosses know how hard it is for you, and how tired you are, fulfilling your existing and newly assigned responsibilities. It is you who know the most about the details of your work. Therefore, until you voice the problem, they will not know about.
Tell your boss about the situation.

Talk with your supervisor about your workload. Explain why it has risen so much over time. For example, you were assigned the duties of a departed employee, and have not been removed. The volume of work for some clients has increased for certain reasons, etc. You know about all the facts and nuances like no other.
Suggest options

To find a solution to a problem, it is important not only to voice it, but also to offer options for solving it. What is the best way to allocate some responsibilities? What tasks can be postponed for a while? Imagine how to find a way out, how feasible it is and talk about them.
Find compromises

If the leadership will resist or inaction, then you should insist on and convince him to find a compromise together. Bring the idea that all work should be done well, because only such a result will benefit the company. And if employees do not have enough time to complete it at the highest level, then it is necessary to distribute the tasks. You are in the same team and you have the same goals. Therefore, in difficult situations, you need to act and solve problems together.
Keep balance

If you are working on two tasks at the same time, and they completely take your time, and a third appears over the horizon, then you will have to give up something. Explain to your superiors that one of the tasks will need to be postponed for a while. Define the priority of each of them, describe the stages of work and their duration. You can not upset the balance and hope that this does not affect the quality. But you, as a performer, can provide reliable facts and predict the result. A good leader knows what the company is pursuing. And if you are really overloaded, then it will go to your meeting to improve the quality of the work performed.