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patient may have symptoms episodically due to triggers. In that case it is better to prevent triggering events.
Currently in my view you should meet your physician as soon as possible as current problem may be related to complication of bulimia (blood in vomit due to abdominal mucosal tear). You may also need some investigations and concurrent psychiatrist
consultation. Lab test on vomitus can be done to rule out presence of blood in it.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal