A 47-year-old woman came to the admission room with complaints of general weakness, dizziness, vomiting with blood clots. Condition onset was 3 hours ago. The patient has no preceding illnesses. Blood pressure is 90/60 mm Hg, pulse is 106/min., of poor volume. The abdomen is soft, with mild tenderness in the epigastrium. Blood test: erythrocytes – 2.1 × 1012/L, Hb- 70 g/L, hematocrit – 28%. What tactics should the doctor on duty choose?