Locating the Source of a Strong Bitter Odor in Basement?

Hi, unless I missed something, I noticed all the comments on smelly odor in the house was posted 2013 thru 2017. I didn't see a posting after that. Well, my house is 12 years old (built in 2007)and was very well built, (I believe) it kept the smell of a new house up until about little over two months ago. I never had or have any issues with any bugs or rodents of any kind. However, I noticed the smell of a garbage-like scent in our house here in Orlando Florida about 2 months ago, or so. The smell seems to stay in the kitchen only. I don't know what to do, I have torn apart everything and anything that is in the kitchen area, on several occasions.. I am beginning to wonder if the smell is coming up thru the drain, even though it doesn't appears to be. I am the only one in my family that can smell it.

My family appears to be nose dead. The smell is so strong sometimes, especially when we close up the house and go out, when we get back and open the door it smells just like garbage, even if the garbage is empty and all the dishes are clean. To save on water and electricity I don't use the dishwasher to wash the dishes, only to drain them after they are washed and about once a month I plug in the dish washer and let it wash itself out with bleach. I have also washed out my garbage pail with strong bleach on so many occasions, but that does not help. Can some one help? I am going crazy with the smell. My friend came home with me one day and she said she smelled the odor strong when we entered the house. I don't know what to do. Can someone please help?.