A 3-year-old male presents with his mom with chief complaint of vomiting and recurrent abdominal pain. Her son will intermittently cry and refuse to eat, followed by normal activity. His appetite has been decreased. VS are normal. Physical exam reveals a patient who appears stated age, nontoxic, and playful. Your physical exam, including abdomen and GU, is normal. The mom rushes out several minutes later and notifies you that her son is crying and holding his abdomen. What’s the diagnosis, and what’s your next step in your evaluation and treatment?