Fishy odor

Okay so I have a fishy odor, I got tested and I do not have an STD, and I don’t have any infection. So can someone PLEASE tell me what the heck is wrong with me. My partner doesn’t car and said he loves me regardless but at the same token he won’t go down on me because obviously it’s not the most inviting smell. I also was recently diagnose it endometriosis if that helps at all. So can someone please help and explain to me how to fix this. I’m so clean and I shower everyday I don’t use harsh soaps I do everything right but this is so embarrassing and I’m sick of crying about it