Fishy smell in my vagina keeps on coming back?

last month after my monthly period (starts on 7th-of the month), i i had the fishy smell from my vagina, no discharge. it happened i was with the doctor for a papsmear but the doctor only checked my vagina and she said it's clean, no need for papsmear. i told her about the fishy smell, she said it's normal. i observed days and days until it came to more than a week and smell is still there and very strong. I did not go back to her anymore, I washed my vagina with apple cidar vinegar and bought vagina suppository for 7 days. after that, smell was gone for a while. But to my surprise, my monthly period came earlier, 1st of the month. then after my period, the fishy smell is back! so i bought again vagina suppository, but after a day, the fishy smell is again back. what will i do? can anyone tell me why i am experiencing this? can anyone tell me what brand of vagina suppository is the best? thank you.