there are quite a few disease can cause vomiting.
how is your vomiting like ,projectile vomiting is more like a problem in brain(bleeding, tumor). Chronic kidney disease with high serus creatine also cause vomiting.
chronic nausea and vomit is more like a problem in digestive system: GERD(gastric-esophagus reflux disease), ulcer, hepatitis.
gallbladder problems usually presents pain in the right upper abdomen.
you should go to the hospital and get a systemic test.