What Are My Chances Of Suing My GP for Missing Diagnosis?

After years of telling my GP about pain in my lower, ride side she never ordered the right tests, never asked for a urine sample (we are talking at least 4 years of this pain) did not try to resolve at all and then sent me recently for an ultrasound of the abdomen area (NOT where the pain is) I got pissy with the tech doing the ultrasound who did not want to "question the doc's orders) she discovered kidney stones on my right abdomen and said - yeah, I will do this area you pointed out...long story short - huge stone that can only be removed surgically, I currently have a stent in (painful) and will have dye run through tomorrow to see how much function is left before the surgery so if it is less than 20% - I will need kidney removed according to urologist. Aside from the expense of all of my co-pays, lots of pain, downtime and only one kidney left. What do you think??