Before discussing further, how were you diagnosed as having Hashi's? Was it based on TPO ab and TG ab tests? What was the dose of Armour with which you felt pretty well? Can you post test result from that time? Why was the dose increased? Are those recent test results indicative of the 75 mcg T4 dose?
Upon doing some reading I found the following: "About 5 % of patients with a diagnosis of Hashimoto’s thyroiditis based on clinical grounds or by ultrasound appearance have no measurable thyroid antibodies. 5% is a long way from 30%. Also from that same source, "The researchers made the diagnosis of antibody negative Hashimoto’s thyroiditis by the following criteria: 1) An ultrasound showing the characteristic a hypoechoic pattern of Hashimoto’s thyroiditis, 2) two blood TSH levels >4.0 mU/ml within 2-6 months of each other and. 3) the absence of serum TPO or thyroglobulin antibodies on two occasions."
Would you say that your ultrasound and TSH levels fit that diagnosis? What were your thyroid related test results and reference ranges at the time of diagnosis?
I also meant to ask what symptoms did you have when diagnosed as having Hashimoto's?
You said you were doing pretty well on 45 mg of Armour, but still had some fatigue and depression, so the doctor increased your dosage to 60 and you went hyper. Does that mean you were having hyper symptoms, or that your TSH dropped below range?
Also, please respond to the question about your test results and reference ranges from the time you were diagnosed as hypothyroid.
Hypothyroid patients taking significant doses of thyroid med often find that their TSH becomes suppressed below range. That is a result of taking the dose all at once, when our bodies are previously used to a slow continual flow of thyroid hormone. So the equilibrium among TSH, FT4 and FT3 is significantly changed. A suppressed TSH does not mean hyperthyroidism, unless there are hyper symptoms due to excessive levels of Free T4 and Free T3. You started with a relatively low dose of 45 mg of Armour. Since you still had a few hypo like symptoms on 45 mg of Armour, going to 60 mg should not have been enough to cause those resultant symptoms. I would be more suspicious of that being a reaction to the increased dosage, caused by low cortisol or low ferritin. Switching to T4 + T3 med and then T4 only would seem only to confuse the diagnosis.
If it were me I would want to go back to what had worked best for me so far, and also test for cortisol, ferritin, Vitamin D, and B12. The best test for cortisol is the diurnal saliva cortisol (free cortisol) tested at 4 times of the day. If the doctor won't order that, then the serum cortisol (total cortisol) is not nearly as revealing, but will have to do unless you want to order a kit online and pay yourself. Cortisol is very important for a hypothyroid patient. Too low can cause reactions. Too high offsets some of the effects of Free T3. Cortisol is supposed to be confirmed as optimal before even starting on thyroid med.
Note the following conclusion from a recent, excellent scientific study. "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." I expect that you have never been anywhere near those levels yet. So you need to find out why you reacted as you did to the small increase in Armour Thyroid. I expect that you are going to have to have some interesting discussion with your Endo.