This is a real condition called Trimethylaminuria.
https://www.news.com.au/lifestyle/health/why-does-my-bo-smell-like-poo/news-story/8e93b9f7b7703ddeb40c308a5d8abc99?sv=c4d9beccbf6c7c166ac525fcdd82a35c
https://hybridrastamama.com/do-you-smell-like-poo-what-you-need-to-know-about-body-odor/
https://www.vice.com/en_us/article/mgm8k8/the-medical-condition-that-makes-you-smell-like-rotting-fish
Start out by talking to your doctor. It's a rare condition, so you may need to educate yourself, then educate your doctor. Let us know what happens.
You