It's no longer the effects of the synthroid in your body... on your body that have anything to do with your ongoing health complications and crashes.
It is the sustained damage your organs and body systems have suffered over the course of what seems to be unnecessary synthroid intake.
Hormones are very powerful substances and thyroid hormones in particular can affect metabolism, mood,
metabolism, temperature regulation, nervous system function, energy levels, skin integrity, digestion, heart function and so on.
One important thing to consider looking into is Hypothalamic-Pituitary-Adrenal (HPA) Axis Dysregulation, resulting in Adrenal Fatigue, a very complex condition and not recognized by conventional medicine.
You would have to consult a Functional Medicine Doctor
as conventional Endos only recognize and treat Adrenal Insufficiency which is stage 4/end stage Adrenal fatigue.
It's a little too late, if you have to wait for adrenal failure in order to get treatment!
Functional Adrenal Stress Profile, is the recommended test
(salivary) to get, but only available through a Health Professional.
Best wishes,
Niko