There are a lot of recommendations being posted by well meaning people here on this site. My suggestion first and foremost is to schedule a visit with your family physician if you have one, or visit a free clinic if there's one available in your area.
I have been diagnosed with IBS-C (Irritable Bowel Syndrome with Constipation) by my gastroenterologist. My liver, various lab tests, procedures and xrays are all normal.
I have not been checked for TMAU but plan on it. Right now I'm on the yogurt and probiotic train (just started) and I've noticed a slight reduction in my ammonia Body Odor . Maybe, just maybe there is a correlation between the good bacteria in yogurt decreasing my odor? I certainly hope so. Good luck everyone!