Ten hours before initial observation patient had frequent feces and vomiting. Fecal and vomiting masses looked like rice-water. Nausea and abdominal pain weren't observed. Hiccup and convulsions of lower limbs, temperature 35,4°C, hoarse voice, greyish wry face, acrocyanosis were observed. Respiratory rate 40/min, threadlike pulse 120/min, blood pressure 40/0 mm/Hg, abdomen is drawn. What treatment measures should be taken first of all?