Feeling anxious and stressed

Anxiety is a feeling of worry, nervousness, or unease about something with an uncertain outcome; strong desire or concern to do something or for something to happen.
Stress is a state of mental or emotional strain or tension resulting from adverse or demanding circumstances.

Your years at university are supposed to be to a certain extent - stressful. It is quite normal to worry about your exams or essay grades, but it is highly important to do your best to avoid unnecessary stress. For example, not meeting your deadline without a considerable reason or having a night out before an exam is definitely a bad idea. Anxiety is a state where you expect something bad to happen on a constant basis. This state is usually a matter of emotional reasoning, which comes from your past experiences projected onto a current situation. To deal with anxiety, it is vital to assess the probability of the bad outcome you are expecting to occur. For example, you could ask yourself "how realistic is my fear?".

If your feelings of stress and anxiety are caused by external circumstances (not related to your studies/work or something you can influence directly), it is usually harder to deal with them on your own. Should you feel that such a state adversely affects you, please do not hesitate to seek professional help.