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and anorexic patients are on on high risk for developing multiple medical complication and infection. Fever
may be indicator of presence of infection which may lead to abdominal pain
Currently in my view you should meet your physician as soon as possible as current problem may be related to complication of anorexia/bulimia or unrelated to it. You may also need repetition of tests, new investigations and concurrent psychiatrist
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal