If it was me I'd also get a 2nd and 3rd opinion. Try to find the best urologist in your area and get down to the bottom of it.
I know that it scary to think that the problems will come back, but trust me by far the better option is that you do not have a defect. In that case hard work and determination can get you into a good state of health.
watermelon could be too cleansing too, it is a very powerful kidney cleanser. The hunger part of your symptoms are a good sign, the dizzyness is not good. Check your blood pressure or go to a doc have them check it. Kidney problems can cause serious pressure drops/differentials.