Goldenrod extract might help, too.
There are remedies for kidney stones, but if it's no longer in the the kidney in don't know. the main herb is called gravel root, which is pretty self-explanatory. One formula is Stone Free by Planetary Herbals.
To help dissolve the kidney stone, do this pranayam twice a day.Allow 3 months to notice the benefit.
Build up your timing gradually.If you feel tired or dizzy, stop and resume after one minute.
Kapalbhati pranayam -(Do it before eating) Push air forcefully out through the nose about once per second. Stomach will itself go in(contract in). The breathing in(through the nose) will happen automatically. Establish a rhythm and do for 20 to 30 minutes twice a day. Children under 15 years – do 5 to 10 minutes twice a day.
Not for pregnant women. Seriously ill people do it gently.
If you can get patharchata leaves, then eat two leaves a day.
Pure lemon juice.
No sweetener. Not from concentrate.
This has been used for years and often reduced the stone and the pain.
Otherwise - sometimes real pain medication is needed. Out-patients might be necessary to get a prescription so you can have relief until it/they pass.
My husband has kidney stones. He is not supposed to eat lots of peanut butter or peanuts or kidney beans, etc. Drink lots of water everyday - stone or not.
Let me know how you do.