Problems down their🙄🙄

So i have this problem down their. Ive had it for almost 3 years, SORRY FOR ALL THE INFO! Its white creamy looking discharge 24/7 and it makes me smell soooo bad! Of fish! I shower twice a day so i know im clean. Ive had loads of tests done i dont have no STI nothing like that but when im on my period the smell goes, weird i know. It also went while i was pregnant although my vagina lip used to swell up sooo bad while being pregnant it went. Does anyone have the same problem or know what it could be!? Ive been to the doctors many times but still have no answers!!