Last Sunday morning, I woke up with severe pain in my chest and upper back. Went to the emergency room and they did ekg and blood work. Said it was acid reflux and gave me prescription for protonics but I alread6 take them daily. All week, I’ve been having nausea and rapid pulse. Today, I had the same symptoms, severe pain in stomach/chest and upper back, nausea and rapid pulse. Could it be gallstones/gallbladder?