Hello, Thank You for consulting HealthcareMagic! Your symptoms of- urine color is pale yellow but little oily and white small skin like particle - may be due to variety of things like loss of protein in urine or due to urinary tract infection or some other kidney disorders. Missing of periods, nausea etc may also be due to pregnancy. Check for that, if it is a possibility. However, a Physical examination is mandatory to assess this since there are variety of other causes that needs to be ruled out. You may need an Complete urine exam and ultrasound examination as well Stay healthy and thank you for consulting! Please follow up, if you need clarifications.