Suggest Treatment For Intense Pain In The Rib

I'm 22, 6'2", 127 Lbs (no recent change in weight). For about two weeks I've been experiencing intense pain in my lower left floating rib (I may have had pain in the same spot before, but not as painful, definitely no recent trauma). There is intense pain when pressing on the rib, and I also have pain in my back and rib when lying flat on my back. I can't sit, stand, or sleep comfortably. My heartrate has been about 118 every time I've gone in to the doctor (normally my resting heart rate is between 60-67). The pain is bad enough to wake me up at night, and is also messing me up in school.
I've had: CT of Chest, CT of Abdomen, X-ray of chest, X-ray of back: All Came Back Normal! I've also had a blood test for proteins (testing for Myeloma): NORMAL. White Cell Count: Normal; Some test for elevated bacteria: Normal.

I am out of my mind on this, and I have finals in a month. Please just think of something good to test for because this is ridiculous. Give me a good guess.