Won't solve your current problem, but talk to your doc about using potassium citrate as a future preventative for stones. You can either use OTC or a prescription version <[
www.urocit-k.com] Turns out that it is the citrate that is the active ingredient. It will change urine pH and reduce the likely hood of future stones by ~85% (as I recall - stats should be in the prescribing info on the link I posted above).
I had two stones 20 and 18 years ago, and investigated how to not have them again after the 2nd stone.
Not saying this will help pass your current stone.
George