Difficult to say without examination.
It sounds like comprehensive imaging tests were already done. If there was evidence of metastases, it would have been appropriate evaluated with the tests you have already had.
If there are areas of suspicion or concern, then a biopsy can be considered for a more definitive diagnosis.
As for further testing of your symptoms, you can consider an upper endoscopy to evaluate the causes of nausea and vomiting. An obstruction, mass, GERD, ulcers, or inflammation of the upper digestive tract can all lead to the symptoms you have described.
These options can be discussed with your personal physician, or in conjunction with a GI evaluation.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com