A 32-year-old female complains of dizziness, headache, palpitation, tremor. For the last several months she has been under outpatient monitoring for the increased arterial pressure. Since recently such attacks have become more frequent and severe. Objectively: skin is covered with clammy sweat, tremor of the extremities is present. HR- 110/min, AP- 220/140 mm Hg. Heart sounds are weakened. In blood: WBCs - 9,8 × 109/l, ESR - 22 mm/h. Blood glucose - 9,8 millimole/l. What disease is the most likely cause of this crisis?