Ultrasound. A gallbladder attack is characterized by right- or middle upper abdominal pain (severe, pressure-like, noncramping, nonburning) that typically lasts for an hour.. Associated symptoms include nausea+/-vomiting+/-chills. The pain often radiates around into the back and/or shoulder. Attacks are often precipitated by fatty or fried food. If you have these symptoms, an ultrasound will confirm the dx.