Hi,
Nausea during and after eating, even while not eating for a longer period of time,
unexplained weight loss, diarrhea and
blood in stool recently and such symptoms as you have mentioned may be due to the following reasons:
Liver function problems.
Gastritis related issues.
Intestinal problems causing reflex nausea.
Psychological factors.
This can be diagnosed in the following ways:
Consult a Gastroenterologist for clinical evaluation and an actual examination.
Colonoscopy is already normal hence get the upper GI Endoscopy. Barium studies or CT Enteroclysis.
Tests of blood for CBC, diabetes, liver and pancreatic functions along with kidney and thyroid functions. Tests of stool for 3 days helps a lot. All these will lead to a proper diagnosis and helps in proper management. Per-rectal digital examination and ano-proctoscopy to see for hemorrhoid as you have blood in stool.
Take a course of a PPI like
Pantoprazole. Domperidone helps a lot for nausea. Antacids if there is acidity related problems. Rest of the treatment as per the cause found.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T Chandrakant,
General Surgeon