Benefit of Hypnosis on Smartphone for Acute Post-operative Pain (HYPNO-APP)

Inclusion Criteria: * Patients aged 18 years and over * Complicated acute appendicitis with generalized appendicitis, coelioscopy emergency surgery * Signature of the written informed consent form by the patient * Affiliation to a French health insurance scheme or equivalent * Patient inderstands French and has a smartphone with internet access Non inclusion Criteria: * Uncomplicated or complicated appendicitis of abscesses, presence of an intraperitoneal abscess, a plastron, uncomplicated appendicitis of generalized peritonitis * Patient with a neurological, visual or auditory condition where videos cannot be viewed * Presence of active cancer, a malignant hemopathy, drug addiction, coagulopathy, immunosuppressive treatment * Non-acute or interval appendectomy, i.e. after antibiotic treatment of a complicated appendicitis of the plastron or drainage of an appendicular abscess; * Vulnerable people: adult under guardianship, curator ship or deprived of freedom. * Medication or pathology affecting ability to discern: Severe psychotic disorders * Patient refusing to monitor anxiety and pain via smartphone * Patient already medically monitored for anxiety, depressive or chronic pain syndrome