Going to the doctors is something that can help.
These things cannot be cured by magick, herbal remedies can help the symptoms but they will not cure it and are not to be used as a replacement for medicinal help.
For kidney stones, as far as I know, you just have to let them pass (or have surgery). Changing your diet is a good way to help prevent them. But no, there won't be any magical ways to cure these.