I also tried herbal treatment (South American ....XXX? Picha?) for 3 months last year - no change in size of stone - and now have received a pouch of Watermelon seeds from "Heritage Store" in the USA. Is it too late to try this watermelon tea - ie for results before the 9th June?
Also, you said that doing nothing could lead to permanent damage to the kidney. Even if the stone is lodged near the bottom end of the ureter?