Gallbladder attack symptoms include nauscia, sweating, swollen abdomen, and pain primarily below the right rib cage (stabbing pain) and somewhere under the right shoulder blade. That was what I went through. Also after my surgery I did a ton of research to learn more about what my body went through. It's very interesting to learn how the digestive system works and to see a picture of how all our organs are linked to each other and digesting food! I sound like a dork but I have learned a lot about my body through this not-so-fun experience!
I encourage you to go to the ER and they will obviously check your blood results. Enzyme levels and white blood count levels can help identify what is going on with you! Also an ultrasound of your abdomen will pinpoint the problem.
This is a common procedure to have done if it ends up being your gallbladder. Also, wanted to mention most people experience gallbladder attacks at night!
I am not a doctor but hope my advice can only help you.