Thanks For the query.
Your symptoms of foul smelling yellowish vaginal discharge
suggests trichomonas infection.
I suggest you to get a vaginal swab test for diagnosis.
Treatment of choice for trichomonas infection is metronidazole
Your partner should also be treated at the same time to prevent reinfection and further spread of the disease.
In addition, avoid sex until you complete treatment and have no symptoms.
It is important to take all of your antibiotics, even if you feel better.
Hope this helps.