I am 49 yrs ol male caucasian, around 2 weeks ago i developed  upper abdominal dull pain afler eating , i stared to notice the urine is brown and smelly and stool looks pale, recently i started to have back pain in the middle and upper left side really annoying pain also i have nasal discharge green colur i dont have apetite , feel sick and lost 4kg in 6 days , GP sent me for blood test and he said everything is fine only the BILURIBIN is borderline high and is not convinced that this is serious and gave me Omeparzol for Gastritis,i know something is wrong here because i know myself i am usually very energetic and i always had apetite , it affects my job i cant even concentrate what i am doing . I want to know what kind of test to do to rule out PC  , thank you all!!