More info on...
Anxiety UK is a national charity helping people with anxiety. Their website has information about symptoms, causes, treatment and opportunities to get involved with the charity's work: https://www.anxietyuk.org.uk/
MIND's website also includes information on panic attacks, which can be caused by anxiety: https://www.mind.org.uk/information-support/types-of-mental-health-problems/anxiety-and-panic-attacks/about-anxiety/
Also available on MIND's website is a guide for supporting staff who are experiencing a mental health problem: https://www.mind.org.uk/media-a/4661/resource4.pdf