There is much to discuss, but first please tell us about what symptoms you have.
Based on all those symptoms, which are the most important indicator of thyroid status, and your Total T4 level being below range, and your Free T3 level being right at rock bottom, I'd say you are now hypothyroid and in need of an increase in your med dosage. the 90 mg of Armour was probably not enough for you to relieve symptoms, and the reduction made it worse. Changing your dosage based on TSH alone is totally wrong and borders on malpractice. Many doctors don't understand that TSH is a very poor indicator of thyroid status in the untreated stare, except at extreme levels because it has only a weak correlation with Free T4 and Free T3, the biologically active thyroid hormones, and a negligible correlation with Tissue T3 Effect, which determines a person's thyroid status. After starting on thyroid med, the equilibrium among TSH, FT4 and FT3 is completely different and TSH has little relationship to thyroid status, so it should never be used to determine med dosage. Confirming this is this conclusion from a recent, outstanding scientific paper: " Hypothyroid symptom relief was associated with both a T4 dose giving TSH-suppression below the lower reference limit and FT3 elevated further into the upper half of its reference range."
In addition, to raising your med dosage enough to get Free T4 to at least mid-range, and Free T3 into the upper third of the range, there are several other variables that significantly affect cellular response to thyroid hormone. Those are Vitamin D, B12 and ferritin. Also cortisol. D should be at least 50, B12 in the upper end of the range, and ferritin should be at least 100. Cortisol needs to be optimal also. You can confirm what I am saying by clicking on my name and then scrolling down to my journal. There please read at least the one page summary of a full paper on Diagnosis and Treatment of Hypothyroidism: A Patient's Perspective". You can also use the one page summary with your doctor to be sure you get the testing and treatment needed.