A 42-year-old man works in a boiler room. He complains about girdle headache and recurring vomiting. There was also short-term consciousness loss. Objectively: increase of tendon reflexes, spontaneous myofibrillations. AP is 150/80 mm Hg, Ps- 104 bpm. Visible mucous membranes and cutaneous surfaces have crimson colouring. What is the most probable diagnosis?