The advice I'm giving you is similar to another poster. As soon as possible get tested for TMAU and in the mean time go on the TMAU diet and cut out all meds and herbs that you don't 100% need to take. Also stop drinking caffeine, alcohol and avoid any veggies such as broccoli, onions, and asperagus.
I suffer from severe allergies - to the point where I had to have surgery on my sinuses. Normally I would take allergy meds to handle it, but with my condition I know allergy meds will make me smell so instead I use a nasal spray and rinse out my sinuses with salt water.
A good probiotic to take is Pearls. I take 2-4 a day. And a good digestive enzyme is Life Extension. I've tried several different brands and these are the two best I've found.