"I haven't been tested because my family physician thinks it's all in my head" switching family doctors might help, I switched family doctors myself or ask make up a gastro complaint and ask to be sent to a gastroenterologist, keep trying! and if you ask for a standard blood test as part of a physical that should rule out liver or kidney damage. The test on mebo you can do without a doctor's referral it's $150. Also on the mebo website there's a protocol for tmau like taking copper chlorophyllin, activated charcoal 3 hours away from meals, vit b2, lower choline meals but stay above the minimum as noted by USDA if you test positive. To test if it's all in your head or not in my opinion anyway if people have stated to you numerous times that you smell directly or many time indirectly different people in different environments it might be true. Otherwise you could have anxiety, somatic delusion or olfactory reference syndrome and you can get help for this if this is the case notsaying it is.