Mike, anyway all those you've tried have acted primarily on serotonin. I wonder if something that acts on another neurotransmitter like wellbutrin might be worth a try if not alone but in augmentation of your "best tolerated" SSRI.
Doxepine is another TCA and is often used for those with sleep issues but I wonder about that one since the bad reaction to trazodone(another TCA).
Well I know you need to give remeron it's go so hope the best comes of it. In the mean time keep me/us posted and I'll keep thinking about other things to run by the doc.
I hate to ask but have you seen a counselor(I know you mentioned all alternative therapies so just have to ask)? Just to make sure there's not some underlying experience/emotion, etc, bugging the crap out of you that you never have gotten off your chest, etc. Just asking.
Now, could it be you're sensitive to SSRI's(all serotonin antagonists) and need a low dose. I was on lexapro 20mg and feeling anxious/irritable more so that when at 10mg, or 15mg so I skipped a day and started taking 10mg and have felt much, much better. I have been on other(prozac, 40mg and 60mg without that issue). But am much better on 10mg of lexapro and figure perhaps for me, with that med needed a lower dose than most(sensitive to lexapro). I just wonder if you pull back on the dose abit instead of starting high to give your body time to adjust to the med., see how it effects you and make slow changes after that. I wonder if your system is just very sensitive to all the serotonin antagonists and you need less than the usual dose. Some symptoms you mention are similar too(NOT the same) as Serotonin Syndrome, see below(I'm JUST referring to shaking/tremor and sweating).
The symptoms are often described as a clinical triad of abnormalities:[1][5]
Cognitive effects: headache, agitation, hypomania, mental confusion, hallucinations, coma
Autonomic effects: shivering, sweating, hyperthermia, hypertension, tachycardia, nausea, diarrhea.
Somatic effects: myoclonus (muscle twitching), hyperreflexia (manifested by clonus), tremor.

Could this be a "touch", some "low grade" Serotonin Syndrome and you just need a lower dose(who said the syndrome is "all or nothing")? NOT saying it is just thinking outside the box a bit and using some logic. Think it over. Message me any time. Alankay