What do I do?
I have TMAU (though I have not been tested for it, there is nothing else it could be) and I have a problem with my soon to be step father.
The first thing to do is to get tested. How can you do anything about it if you're not sure what the problem is? For instance from what I have read here on this forum, and the internet it could be caused by faulty genes inherited from your parents, or because of a liver, or kidney problem. How you treat the problem will differ.
just reading your post indicates the amount of stress you are under which can, and will exacerbate the problem regardless of the cause. So staying home cooped up is not the way to go. You are depriving your body of 3 things that it needs, Fresh oxygen, exercise, and the Sun [Vit-D3]. You should be out walking in the sun breathing fresh oxygen. Even if you house is not considered a sick house [ Mold & other chemicals coming from rugs, furniture coverings,etc.] it's not like taking a brisk walk in the fresh air, and sunshine.
Speaking of stress, your stepfather is an a$$hole, and not to bright. He knows you take multiple showers but still can't figure out that it's a medical problem. I know how I would handle the situation, which would be to get in his face, and tell him to F--- off, but that wouldn't be good for you. Maybe after you get tested, let him read it along with everything you can gather relating to the problem. Then tell him to try and help instead of what he's been doing. Explain that causing you stress makes it worse.
Take a look at this article I got off the net. This will show you that it can be conquered. Based on what you posted, I think that you would have what it takes to do the same thing. I feel your pain, and am rooting for you. I have another theory, but try this first because it will be easier. Let us know how you do. http://www.dailymail.co.uk/health/article-2130423/Mother-loses-stone-special-...