Mental health crisis means different things to different people.
It could help to tell someone you trust, such as a family member or a friend who can then help you decide what to do. They can also contact services on your behalf.
Check your care plan, and:
During office hours contact your care coordinator or the duty number for the team that is supporting you. If you don't have their details, visit NSFT's service finder.
Or call the urgent mental health helpline on 111 and select option 2.