I fell in the bathroom and bruised my nose yesterday. I have now dark circles under my eyes and it hard to breath. What tests do I need?

With any severe fall and head trauma, you will need to get evaluation in the emergency department especially if you’ve had loss of consciousness.  You will need a physical exam focusing on your head as well as your eyes.  The doctor will need to check if you have any blurry vision, blind spots, and if your eyes have full ranges of motion.  A head CT will tell the doctors if there is any bleeding around your brain.  In addition, a CT scan of your sinuses will be needed to evaluate the integrity of your facial bones (there may be damage as you described bruising under your eyes).  Finally, if there is any damage to the bones around your eyes or if your eye exam is abnormal, an opthalmology consult would be needed to further evaluate your vision.