Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek urgent or emergency care for:
Elsewhere, use the local emergency number or crisis service.
Arrange a prompt appointment if bingeing or purging is occurring, symptoms are increasing, or dizziness, weakness, dental damage, reflux, or menstrual changes develop.
A clinician should also review any laxative, water-pill, supplement, or medication use.
Follow-up is usually more frequent early in treatment.
Appointments may track bingeing and compensatory behaviors, hydration, pulse, blood pressure, laboratory results, mood, and progress with regular eating.
Dental follow-up may be needed when vomiting has affected the teeth.
The article also says
Recovery is rarely perfectly linear.
Increased urges or a return of symptoms does not mean treatment has failed.
Contacting the care team early can help prevent a brief setback from becoming a longer relapse.
In the United States, a person in a suicidal or mental health crisis can call or text 988.
Every sign above is quoted from the sofidex article on Bulimia nervosa. If you are not sure, err upward — it is always reasonable to be checked.