Immediately after eating a sausage/egg croissant from dunkin donuts i got a 9/10 stomach ache. almost instantaneously. no nausea or diarrhea, just bad abdominal pain. whats likely dx & best course of action?

Stomache: This could have been a simple case of indigestion or food intolerance, but since this was a fatty meal a gall bladder attack is a definite possibility. If abdominal pain has subsided, just eat lightly for the rest of the day. Look for future episode of abdominal pain after eating a fatty, fried or greasy meal and contact your MD for investigation which includes a gall bladder ultrasound.