Patient Case:

Name: NAME_1
Age: 32
Gender: Female
Occupation: Office worker

Presenting Complaint:
NAME_1 presents with a two-month history of recurrent episodes of severe abdominal pain. The pain is located in the lower right quadrant and is accompanied by nausea and vomiting. She also reports a low-grade fever and occasional diarrhea during these episodes. The pain tends to worsen after meals and is sometimes relieved by passing gas or having a bowel movement. NAME_2 has noticed a gradual weight loss over the past few months.

Medical History:
NAME_2 has a history of irritable bowel syndrome (IBS) diagnosed five years ago. She has been managing her symptoms with dietary modifications and occasional antispasmodic medications. She has no other significant medical history and takes no regular medications. She denies any family history of gastrointestinal disorders.

Physical Examination:
During the examination, NAME_2 appears uncomfortable and exhibits tenderness in the lower right quadrant of her abdomen. No masses or organomegaly are palpated. Bowel sounds are slightly increased.

Investigations:
1. Complete blood count: Mild elevation in white blood cell count (WBC)
2. C-reactive protein (CRP) level: Moderately elevated
3. Stool examination for occult blood: Negative
4. Abdominal ultrasound: Shows thickening of the terminal ileum and cecum
5. Colonoscopy: Reveals deep ulcerations and cobblestone appearance in the terminal ileum

Please provide a likely diagnosis for NAME_1's condition.