“Why do I have body odor?”

My problem is that I shower twice every day, brush my teeth, wash my laundry every Sunday, put on deodorant every time I get out of the shower yet I still smell like I haven't showered for months. This has been occurring for about three years and it seems that no matter what I do the smell will never go away. It's not coming from my armpits. It seems as though it's coming from my pores, from my sweat, and even from my breath. I think it might be an internal body odor cause I clean my body very well yet it never goes away. This smell is not a normal body odor. It's the smell of feces. When I first started smelling like this it was the smell of farts and then it intensified and turned to the smell of feces. I've tried everything I can and I still can't find answers. I've done the research and I think I might actually have a metabolic disorder called TMAU where my body isn't able to get rid of toxins in my body properly and that's what's causing me to smell this bad but I'm not a hundred percent sure. What do you think is wrong with me? Do you think I have TMAU?