Thank you for this long and comprehensive post. Your profile is very like many of us who have found our way to Greg and his oils. His hard work in trying to find out sources of the Iodine/Selenium/Molybdenum that actually work has led him to develop the companion mineral oils that go with his B-12 Oils. If one has multiple B-12 snps, as well as MAO/B2 issues, this may be a worthwhile path to check out. Greg says that of those he has worked with with this profile (and I believe there are over a thousand of us or more), he says 100% of us are B-12 deficient (often 'paradoxically' which is a challenge to understand!), and 80% of us are B2 deficient.
Unfortunately, like you, it has been very hard to convince a doctor to look into my thyroid as a source of problems. Because my TSH falls within the 'normal' range of between .5 and 5, they ignore the fact that my total T3 has been hovering at or below range ( 76-180ng/dL) as far back as I've been keeping track of it (2014). Also like you, a little selenium back then might have gone a long way. Now, who knows?
I've struggled with my health for about 25 years
I'm so sorry to hear you have been struggling for so long.
Yes I am what he calls 'paradoxically' deficient in B12 - i.e. my lab values show high levels of B12 but actually it's not available to me biochemically (it's in the wrong form? ). So am working on that with the TD oil.
Since posting I now strongly suspect the 'musty' weird smell/taste is a detox caused by Molybdenum. I've done an n=1 experiment on myself and the smell increases when I take Moly and decreases when I stop. I also now suspect it may be increased by eating bread or other gluten free high carb products (so wheat/grain products causing it in some way?) but haven't gotten further than that so far. Takes ages figuring things out!