To dream that you are under stress might reflect the stress you are feeling in your waking hours.
The way you are feeling might be filtering through into your sleep state because you are unable to relax right now and the cause of the stress is always on your mind.
The dream could reflect setbacks, obstacles, self-doubt and criticism you are experiencing in your life. Ask yourself if any of these are a result of you or other people. If it’s due to other people- it might be time to let them know, perhaps they can ease the pressure they are putting on you if they haven’t realised just how much you’re suffering.
On the other hand, if you are putting too much pressure on yourself find out why and how you can reduce it to a more manageable state or remove it altogether.
Perhaps you are on the cusp of having a breakdown and need to take some time out to relax and unwind. You might need to distance yourself from whatever it is that is causing you the stress- even if only for a little while for a breather.
Dreaming about stress could be the consequence of some former action- you are punishing yourself for something you’ve done by letting it invade your thoughts and wind you up.
Perhaps you are stressed about something but you haven’t realised it yet. Your sleep state could be warning you that something is affecting you more than you know, and you need to reduce the cause.
On the other hand, it’s possible someone close to you is stressed right now and it’s having an effect on you too. You are stressed by association so maybe you need to help this person find a way to alleviate their anxiety to have an impact on the way you’re feeling at present.