A 48-year-old patient developed sharp headache (“as if struck by a knife”) and vomiting after emotional stress. The patient has a history of arterial hypertension. Objectively, general agitation and facial hyperemia are observed. Marked meningeal symptoms can be detected: nuchal rigidity, Kernig's sign, photosensitivity and general hypoesthesia. The cranial nerves are without pathologies. There are no pareses. Reflexes are brisk and uniform. What is the most likely diagnosis in this case?