I throw up or feel like i'm going to throw up in the morning like early. it's like yellow liquid. why am i doing this?

Maybe IBS, but...: The GI tract has a very limited # of symptoms to signal 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. Directed lab work, imaging, biopsies, stool studies are appropriate in excluding non-ibs pathology.