Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call your local emergency number or go to an emergency department if there is immediate danger.
Contact the professional managing your care promptly if symptoms become much worse after starting or changing medication, side effects are hard to manage, or you are considering stopping treatment.
Do not stop regular medication suddenly unless urgent medical advice tells you to do so.
Seek urgent mental health or medical help if you:
Chest pain, severe breathing difficulty, fainting, or new neurological symptoms also need urgent medical assessment rather than being assumed to be anxiety.
Arrange a routine appointment if worry has lasted for weeks or months, feels difficult to control, or is affecting sleep, work, education, relationships, or daily tasks.
It is also reasonable to seek help for ongoing physical symptoms that may be related to anxiety, especially if their cause is unclear.
Every sign above is quoted from the sofidex article on Generalized anxiety disorder. If you are not sure, err upward — it is always reasonable to be checked.