maybe try wild rice instead?

First I would suggest that next time you have one of these attacks you go to an emergency room and have a CT scan or an X-ray to confirm that kidney stones are truly the problem.  If they won't do that, at least ask them to do a dip test on your urine to see if blood is present.  If it is, even if there isn't enough for you to see it, it points to a moving stone causing internal bleeding as it scrapes its way along the ureters.  This at least will support the kidney stone diagnosis and rule out colon blockage, diverticulitis, pancreatitis, gall bladder, and other issues not related to the urinary tract.   

I actually purchased the urine test sticks to use at home.  They are 'Multistix 10 SG' made by Bayer.  They are expensive, but they will test for ketones, blood, protein, specific gravity, pH, and several other things. They will also test for Leukocytes so you can tell if you have a urinary tract infection as well.  Just do a Google search on Multistix 10 SG and you should be able to find a source for them. 

I wish I could tell you what to do as I'm suffering from the same problem.  If you find out anything conclusive please let us know as many will benefit.  My father suffered from Kidney Stones as does my son-in-law and a couple of friends.  In all cases the only common denominator seems to be reduced fluid intake.  So far I've upped my fluid intake from 1-2 litres per day to 3-4 litres per day.  Only time will tell if this solves the problem.

Lex

Blood in the urine supports kidney stones but you would need a CT scan or X-ray to confirm.  Leukocytes are usually the harbinger of a UTI but blood can be present as well.  Leukocytes can also be present with kidney stones but in this case the infection is caused by the bleeding that the stone is causing rather than the infection causing the bleeding. 

Leukocytes high, possible blood present but not always, a feeling of urgency and some stinging type pain with urination, usually w/fever and chills - probably UTI

Blood present, possible leukocytes but not always, intense pain on lower left or right side of abdomen often radiating to back and lasting hours or days, vomiting or dry heaves, little or no fever - probably kidney stone

I've had both so know the symptoms pretty well.  My guess from your description is that you are experiencing kidney stones.  If my doctor prescribed antibiotics I'd ask if there is positive indication that infection exists (example Leukocytes present in urine).  IF so then take the meds as you could loose a kidney to infection if it gets out of hand.  If he just says its a preventative measure, then I'd be more comfortable not taking them until the tests are more conclusive.  Up to you.

Lex

    Do you mean water tastes sweeter when your ketones are up?  Humans tend to like the taste of sweet.  If RZC makes water taste sweet, I think that may mean that more water SHOULD be drank when we're on such a diet. (or at least while the water tastes sweet).  I could be wrong.  I still have not tried 0carb.  I'm sure you learn a lot more by doing it.

Yes, the sweetness of water on a high animal-fat diet due to some ketone spillage into the saliva, and presumably knowledge passed down the generations to avoid illness, are so far the explanations I can think of for the high consumption of water by Inuit. There may be other reasons as well. It's total speculation on my part, but I'm guessing that eating enough fat to produce a small amount of ketones so that water is slightly sweet may be an optimal level for someone on a VLC, ZC or carnivore diet, so as to encourage the right amount of water consumption. This could be a temporary effect, though, as over time it takes increasing amounts of fat to produce a very slightly sweet taste in my saliva and water, whereas early on less fat produced a very strong sweet taste.