Central upper abdominal pain that radiates to the back, 10 on a scale of 1 to 10, wakes me up in the middle of the night, at that time it s about a 6/10 and gradually gets worse. Causes sweating, weakness, violent vomiting for several hours at a time. PCP and ER said it s just heartburn, but no burning sensation noted, no prior hx of heartburn or morning sickness. 28 weeks pregnant, age 23, 5 ft 4 in tall, weight 170 lbs. Family hx of gallbladder problems (maternal grandmother had gallbladder removed several years ago). Could it be gallstones misdiagnosed as heartburn? OTC heartburn meds have no effect on the attacks. Have had 3 attacks in the last month.