Stress is the feeling of being under too much mental or emotional pressure, and pressure turns into stress when you feel unable to cope. A bit of stress is normal and can help push you to do something new or difficult, but too much stress can take its toll on your body, your mind and your sleep.
http://warwickshire.gov.uk/mentalhealth has information and support for all ages from children to adults.
The ONEYOU site has loads of really useful information on how to manage stress.
The NHS website has great guides around the how to manage the everyday stress we may face as well as understanding serious mental health issues.
Check out this short video about 5 ways to mental health and wellbeing.
Try out the mood self assessment tool from the NHS.