Severe nausea and diziness..dr ordered comprehensive metabolic , tsh and cbc labs..wats goin on?

Don't know yet...: Gi tract signals its distress--nausea/vomiting, diarrhea/constipation, bloating, pain, fullness, bleeding, etc. As you know, many of these characterize ibs, but are also seen with inflammatory, infectious, ischemic, malabsorptive, and functional disorders. Your symptoms may however originate outside the gut. Directed lab work, imaging, biopsies, stool studies are appropriate.