Persistent flashes of right shoulder pain. Intense but short lived. Not gallbladder doesn't feel like pulled muscle. Comes in flashes. What is this? .

Many possibilities. Without knowing your history it is difficult to say. If this as been preceded by increased activity or injury it certainly could be of mechanical cause or irritation. Also referred pain from the neck to the shoulder is quite common and might be considered. As you have fatty liver, an internal source of pain referred to the shoulder is one the list. If this persists i would get a medical eval.