>>2560852I'm not particularly well-versed with the details concerning kidney stones, but there seem to be several prospective studies showcasing a decreased relative risk with with consumption of tea and coffee (among other things, including some juices interestingly, and beer and wine). Also, drinking plenty of fluid in general, while avoiding soft drinks.
http://www.ncbi.nlm.nih.gov/pubmed/23676355http://www.ncbi.nlm.nih.gov/pubmed/8561157 (quite old by now)
http://www.ncbi.nlm.nih.gov/pubmed/16724910 (looks specifically at a green tea derivative).
A few examples of what I found. The articles are open for the public, so you should take a look yourself and not trust me blindly! Did you get any recommendations from your physician?
Either way, get well anon! Mugi will look after you!