Belive or not certain foods can cause a stench in your urine. First of all I would try drinking more fluids, typically 1/2 an ounce of water per pound eg, 100 lbs 50 oz a day. Second one common smelling vegetable is asparragus, so if you are eating them a lot they are the culprit. You can also try AZO which is used to help eleviate UTI pain but it is an antiseptic for the bladder try it for 3 days. Finally not all bacteria give positive nitrite results so consider seeing your PCP for further evaluation.
My diet is just a very basic, boring, non stinky diet. I don't eat asparagus or any other of the typical culprits for causing stinky pee. I drink plenty of water, don't do drugs, etc.
I don't have any bladder discomfort and I have plenty of experience with UTI's and know what to expect with typical UTI's. Taking all of this into account just further leaves me puzzled.
I have some syptoms that can mimic Lupus and wonder if auto immune diseases can irritate the bladder, kidneys or anything else that can cause such terrible, offensive odor.