Immediately after eating severe stomach pain and diarrhea/nausea. Why?

Lots of things... Our brain can't tell the difference in pain signals from heart, esophagus, stomach, duodenum, liver, pancreas, bile ducts, liver, or gallbladder. So illnesses of any of those organs causes upper abdominal pain; gallbladder is most common. A good doctor will ask questions like what brings it on, makes it worse/better, how long it lasts, associated problems. See dr. ; get proper diagnosis; good luck.

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Severe stomach pain, nausea, dizziness, and constipated. What can I do?

Constipation! All symptoms are due to constipation. See your doctor for further evaluation. You may need laxatives, stool softeners. Likely need GI eval with colonoscopy/ endoscopy. Read more...

Diaherra and severe stomach pain for the last 4 days. Anything I eat I run to the bathroom.. Always in pain nausea no energy. I'm on a trip help.

Diarrhea. You may get better without medicines.Best to rehydrate with bottled water alternated with sports drinks with electrolytes. You can try Bismuth Subsalicylate (pepto bismol). A fiber drink like metamucil (psyllium fiber) can help relieve symptoms. If you have more than four loose stools a day or severe symptoms, including fever or blood, pus or mucus in your stools, a doctor may prescribe antibiotic. Read more...