You need to get that checked at the ER! This could be your gaul bladder! I can't stress enough how important you need to get this checked out NOW.
Please note that if you are in severe pain and particularly if your attack symptoms are accompanied by fever DO SEEK MEDICAL ATTENTION IMMEDIATELY. The following symptoms are typical of a gallbladder attack.
Moderate to severe pain under the right side of the rib cage
Pain may radiate through to the back or to the right shoulder
Severe upper abdominal pain (biliary colic)
Burping or belching
Attacks are often at night
Attacks often occur after overeating
Pain will often but not always follow a meal with fats or grease
Pain may be worse with deep inhalation
Attacks can last from 15 minutes to 15 hours