A 38-year-old patient complains of cramping abdominal pain, nausea, vomiting, abdominal distension, inability to pass gas, constipation. The patient had a recent surgery for appendicitis in his medical history. On palpation, the abdomen is painful in all its segments and tense. A splashing noise, unclear signs of peritoneal irritation, and hyperperistalsis are observed in the patient. What is the most likely diagnosis in this case?