I think that you could be having a urine infection with the raised leukocytes even though the other parameters are normal.
I would have also done a urine culture, if you have not had that done already.
Food allergy usually does not cause such symptoms.
It causes itching, hives and sometimes diarrhea as well but not these kind of symptoms. But, having said that, disease do not read books so it may very well be some sort of allergy.
At the present moment, with the symptoms that you are having, raised leukocytes in the urine, I would have given you a course of an antibiotic to see if that would help relieve the symptoms that you are having.
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