What Causes Severe Pain In Right Abdomen Radiating To Shoulders?

ive been dealing with severe stomach pain with pain on the right side that hurts and burns under my shoulder blade i thought it was my gallbladder but the hilda scan says my gallbladder is 80%efface. could i be dealing with gallbladder with the test turning out ok, can stome and inflammtion occur later. ive also been diagnosed with acid reflux and IBS