Yeah, it's probably a good idea to go to a doc and make sure you haven't got a urinary tract infection or kidney disease, to be on the safe side. When I was still eating wheat, dairy, etc., I put off going to the doc once, not knowing I had a UTI (probably with a small kidney stone--wheat was the food that really brought them on for me), and I became extremely ill and my temp went up to 104F. Luckily, my fever broke quickly after that, but I probably could have done some permanent damage if it had continued or worsened.
I don't think all people need to eat lots of plant foods or cook their meats to avoid kidney stones (the Stone Agers and traditional Inuit did not have high rates of kidney stones and no other traditional Arctic hunting peoples have been reported to have high kidney stone rates until AFTER they adopted a modern, more thoroughly processed diet). As I've reported many times now, I found loads of info pointing to the benefits of water (especially Mg-rich mineral water) and a magnesium-rich diet (seafood, seaweed, flesh and eggs from animals fed on magnesium-rich pastures, avoiding sugar, grains and linoleic oils, etc.) for preventing kidney stones (though it may not be enough to repair the damage done from years of a Mg-deficient diet, GI damage, etc.). Americans were ingesting around 500 mg of magnesium per day in 1900 and are now down below 300 mg and eating grain and milk products that deplete Mg levels in the body and/or contain too much poorly-absorbed calcium. (see
http://www.naturalnews.com/023199.html,
http://onlygrassfed.com/index.php?option=com_content&view=article&id=48&Itemid=29,
http://www.bestgrassfedbeef.com/health-benefits.html, etc.)
What one rarely sees mentioned when people write about ZCers getting kidney stones, is that Lex was intentionally restricting water before he got his, and he is probably especially prone to them (he has a family history of them) and many ZCers eat grainfed meats that are lower in Mg and avoid more Mg-rich flesh from pasture-fed organs and eggs. I have a history of Mg deficiency symptoms that improve with Mg replacements, so I continue to take some (stopping them cold turkey brought back some mild symptoms), though at a lower (and gradually decreasing) dose than before (my Mg-deficiency symptoms had been increasing while I had been eating significant plant carbs). I think the problem that ZCers and carnivores face is that we know very little about this WOE, so we aren't aware of things like that the traditional facultatively carnivorous Inuit diet was rich in Mg and included enormous quantities of water (be wary of water intoxication, however).