Yeast infection.
Get the 7-day treatment at walmart or somewhere close to you.
Avoid sugary foods like cakes, cookies, etc until it is gone.
No sex either. Not fair to make your partner itch or end up with it too.
A discharge that has a foul smell is sign of an infection and would need to be treated with antibiotics or something. Go see your doctor, problems like this is life untreated can lead to more serious problems so best to not leave it.
Maybe BV (Bacterial Vaginosis) as BV nab affect fertility if not treated. Probably should to see obygn. How often is the discharge frequency?