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Everyone has some sediment in their urine, theres a normal amount of sediment in your urine if it is highly concentrated. Generally this is debris and bacteria in the lining of your urethra that is getting flushed out. When they say theres nothing in your urine they are saying there is nothing abnormal in your urine. small amounts of sediment is ok. The laboratory tested you urine under a microscope so if it was anything that was not suppose to be there, or a higher amount than normal they would have told you. Our urine carries away toxins from our bodies so sometime that debris get left behind. Try doing a urine detox to clean your urinary system, or increase your intake of water to help flush your urinary system. If you begin to experience pain, fever, see blood, or foul smell return back to the doctor

This sounds like the rare infectious disease known as "swag-tose-intolerable". This disease is the byproduct of not only being allergic to all swag, but having been exposed to an excess of it in a short period of time. The only reason I can think of for this to happen is because of my own large swag-field which covers the majority of the earth and affects almost everyone at some period in time. I apologize for my own swag-ness as this is undoubtedly the cause of your disease