Final answer:
The symptoms described suggest a severe condition that may indicate Crohn's disease.
Step-by-step explanation:
The symptoms described in the question, such as worsening diarrhea, bowel obstruction, and systemic toxicity, suggest a severe condition that requires immediate medical attention. Based on the given options, the most likely cause of these symptoms is Crohn's disease. Crohn's disease is a type of inflammatory bowel disease that can affect any part of the gastrointestinal tract, leading to symptoms like abdominal pain, diarrhea (with or without blood), and weight loss. It is important for the individual to see a healthcare professional for a proper diagnosis and treatment.