I've read enough accounts from people with thyroid problems to gather that the usual tests don't catch all of them-- I don't remember a lot of details (will check what I've got if anyone wants), but apparently the standard test is for a surrogate measurement which might or might not be relevant. And there's argument about what the normal range for thyroid hormones are. However, if you're lucky, Synthroid is effective, safe, and cheap.

More generally, another more comprehensive blood test isn't a bad idea, but going in with more specific ideas about what you want to find out seems sensible.

Basically, this stuff is complicated enough that 5 minutes thought (and rather more time than that spent on research) is called for.

It gets better. I've got quantities of anecdata, but most of it is from women. I hope the situation is better for men, but I'm not counting on it being much better.

A lot of people have to go through several doctors before they find one who listens and thinks. My impression is that about 20% are competent for non-obvious problems.

Being fat and having a problem which affects your energy level are major risk factors for not being heard.

If you decide to go the medical route, there are websites where people rate their doctors.