Severe pain under rib cage on both sides, gradually getting worse.had bloodwork done on liver and gallbladder. but came back fine?

Could be: Any number of 100's of causes, some serious, too many to list here. You should work on accurate diagnosis and treatment with your doctor.

First tests are okay: Your doc is in the process of evaluating you as an outpatient. With the first tests being normal, your doc will likely get additional tests like a gallbladder ultrasound, egd, ct scan. Stay with your doc and eventually you will get a diagnosis. Be well.