With thanks to Dr. Jasmine Shah.
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When you do recognise the signs here are some positive actions you could take:

Talk about your feelings. Talking about your feelings can help you stay in good mental health and deal with times when you feel troubled. …
Keep active. …
Eat well. …
Drink sensibly. …
Keep in touch. …
Ask for help. …
Take a break. …
Do something you’re good at.