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Illness resulting in psychosis
MIND's website has information on what psychosis is, along with quotes from people with lived experience: https://www.mind.org.uk/information-support/types-of-mental-health-problems/psychosis/about-psychosis/
MIND also offer advice in how family, friends and colleagues can help someone with psychosis: https://www.mind.org.uk/information-support/types-of-mental-health-problems/psychosis/for-friends-and-family/
Detailed information about the experience of psychosis can be found on Rethink Mental Illness's webpage, along with links for further reading and information on treatment: https://www.rethink.org/advice-and-information/about-mental-illness/learn-more-about-conditions/psychosis/