Hi Nate,
Yes, a TSH of 1.9 could be too high. I personally would feel like death warmed over at that level (and have). Where you are in the world, and which doctor you have decides which TSH is good and which represents your pituitary being upset with your thyroid for not making enough hormone.
I have a very slightly enlightened endocrinologist in London (by which I mean he is receptive to good reasoning, not that he particularly knows what he is doing, unless he is treating diabetes or infertility), and he thinks TSH should definitely be under 2 (which yours is, but only just). There are physicians in Australia and Germany and in other countries around the world who aim to treat hypothyroid patients so their TSH is closer to 1.0. Then there are places in the world where 3, 5, 8 and even 15 represents the onset of hypothyroidism.
It's crazy to think all these different views all represent hypothyroidism. I'm not sure why it is this way, but the one conclusion I think it's safe to draw is that these people just don't know what they are doing and there is nothing approaching consensus. If you spend any time online reading the histories of patients who have had trouble getting their hypothyroidism resolved, you will see that many of them finally found physicians who felt they were not taking enough thyroid hormone, and once their dose was increased, they felt exponentially better (in some cases, taking small but not sufficient amounts of levothyroxine actually made them feel worse instead of better until they got to the proper dose).
I'm not sure this is the case for you, but given your low morning cortisol and your reverse T3, I think it is enough to be suspect. Have a look at this page:
Reverse T3 (also called Reverse Triiodothyronine) | Stop The Thyroid Madnessâ„¢
If I were you, I would get myself to one of the rare endos who treats recalcitrant thyroid and adrenal problems, hoping they might recognise your pattern and help you sort it out. Here's some info on how to find a decent doc:
HOW TO FIND A GOOD DOCTOR | Stop The Thyroid Madnessâ„¢ and
Thyroid Disease Top Doctors Directory -- Best Practitioners for Hypothyroidism, Hyperthyroidism & More
Salivary tests are now used more commonly by docs to diagnose Cushing's disease (where they use to use midnight bloods to document suspected high cortisol), probably because nobody wants to be doing blood draws at night unless it's an emergency, but there is a study that compares the values of blood and salivary cortisol:
http://jcem.endojournals.org/content.../3647.full.pdf
What will matter also is also what time of day the blood cortisol was drawn, and frequently, the act of having a needle put into your vein raises your cortisol a bit (as opposed to spitting into a tube).
I can see your testosterone is low, but I am not an expert on men's hormones. But I will tell you what my worry for you is: that you will treat the low testosterone, but not see the improvement you would expect because you have some sort of underlying issue going on with your adrenals and thyroid. Then you or your physicians will think that the testosterone is not an issue, and just be generally led astray. If you get those two in order, see how you feel, then you test the hormones again. Then if you are still frankly low in testosterone, you will absolutely know, and then, barring any diagnostics to determine the cause, you can treat, and if you have to be on it forever, then at least you know you sorted everything else out, and that you didn't just jump into something that could potentially be permanent without thinking and puzzling things out that could complicate each other in the correct order.
I think it is better to sort out the adrenals and thyroid first, but perhaps someone else here may argue for sorting out testosterone first, but I think that is the thing before you at the moment is to decide which you need to concentrate on first.