Vomiting with no other symptoms. no nausea, no heart burn, no upset stomach. they have done alot of testing. but nothing is "wrong".

Vomiting: w/out a medical cause MAY indicate a form of panic or anxiety disorder. Please see a mental health pro who specializes in panic disorder and learn techniques to manage it. Please stay in touch w/your doc and avoid dehydration. Peace and good health.

Many causes.: The CTZ (chemoreceptor trigger zone) is the brain's MOST SENSITIVE part. The CTZ causes nausea & vomiting. There are MANY things that could stimulate it- smoking, drugs, pregnancy hormones, perfume smells, diseases, &c. While doctors may not have been smart enough to figure what it is, something IS "wrong" (or else you wouldn't be vomiting). TTYD & keep trying to find it; whatever works is a clue.