non obstructing kidney stones and pain

hey there.. this has happened to me quite often. It is really aggravating because most doctors don't think that you should have any pain at all with a stone that is not obstructing urine flow, but in all actuality those stones WILL cause pain if they are moving alot, and especially if you have multiple stones.. I have 13 stones at my last count.. all between 2-3mm each.. which are small.. most days I am fine, but every other week or so I have a portion of my day that is filled with pure pain.. flank pain.. sudden pain.. then it stops.. I try and increase my water intake and sleep dang near upside down trying to pass them but i usually only end up passing one or two and by my next ct scan I have made more. I go to a "Stone Therapy Clinic" at UK here in KY.. I've been going for almost a year every 3 months.. i can't say that its' helping, but the nephrologists there seem to understand what I'm going through and how it "comes and goes". they prescribe me a low dose of trammadol for the pain as needed which helps the daily pressure on my kidneys and bladder, but when the full on flank pain happens, nothing helps.