To whomever suggested that my atrial fibrillation might be a sign of a
thyroid condition, thanks. As it turned out, it is Graves disease,
something that the FAA can work with.

According to the "Thyroid misdiagnosed as mental disorder" message
thread in alt.support.thyroid, Graves is capable of precipitating
other symptoms.

Checking a TSH is pretty standard emergency medicine care for both new
onset a. fib, as well as suspected depression, bipolar symptoms,
suicidal ideations, etc. There's more to it than just a TSH, but that
is the test we can get 24/7.

-Ryan in Madison
(who's real job deals with this stuff everyday)