Kidney pain

I am a 41/f that has a history of UTI's, kidney infections & kidney stones for about 20yrs. I have been hospitalized numberous times for pain management and stone removal.  Sometimes I have all they symptoms (nausea, frequent urination, burning sensation, fever, etc.) of a kidney infection or stones and sometimes I just get the pain and the nausea.  I have been hopsitalized for a few days to 2 1/2 weeks for my kidneys. I just had my right kidney cleaned out in Nov after being in pain for several months and two hospitalizations for pain management and now I just found out I have several new stones in that kidneys.  
I have seen Urologist, Endocrine drs, Renal drs and mulitple ER drs.  None of them can explain to why I keep getting kidney stones.  Some stones have caused major pain and others have sat in my kidneys for years with no problems.The drs have done every and any test possible from blood work to CT's to MRI's and they still can not figure out why I keep getting the stones.  The most recent test they did was a CT w/contrast to see if I had that sponge kidney disease. The test came back inconclusive. I know that the stones are made up of calcuim. All the blood work comes back with in normal limits.
I am currently in so much pain because of these stones it is driving me crazy. The ER drs and the others are looking at me and telling me that I am drug seeking, which I am not. I currently have several stones in each of my kidneys but they say that because they are not blocking and are so small that they can't be the cause of my pain. I don't have any other symptoms at this time besides the massive pain and the nausea, that they are saying it is not my kidneys and they won't give me anymore then a day or two worth of pain meds. I am in so much pain, that it brings me to tears and crying.  The recent ER dr said I have a back problem and not a kidney problem.  He checked to see if I could stretch (and I could) and the pain doesn't radiate to anywhere. It is just a sharp stabbing pain in my right kidney. I am so afraid of taking pain meds that I might get addicted to them, that I only take them when I can't stand the pain anymore. I know that doesn't help my situation either.  Do you have any suggestions that my doctors haven't told me?

Thanks,