Hi, Severe pain
in abdomen associated with vomiting bile after lunch should not be ignored.
I would advise you the following in such a situation to confirm or rule out any cause.
Rush to nearest Hospital or ER.
X-ray of abdomen in standing position.Ultrasonography
of abdomen and pelvis.
Tests of blood, stool and urine.
Clinical evaluation by a Doctor, preferably a General Surgeon
can help to get the probable diagnosis and to be correlated with investigations.
If there is a surgical cause like intestinal obstruction
or perforation you may need surgery.
IF the cause is medical like gastroenteritis
or so then medical management will help you.
Maintain hydration and electrolyte balance.
Hope I have answered your query. Let me know if I can assist you further.
Dr. T Chandrakant, General Surgeon