My endo has needed to lower my Synthroid (thyroxine) 3 times in the last 4 months. Cannot seem to control hyperthyroid. I am now brruising very easily. Related?

Hyperthyroid. Bruising is not usually a symptom of hyperthyroidism. It is unclear what is going on with your thyroid dose. Assuming you are taking it correctly, there could be problems with absorption, or some remaining thyroid tissue that is functioning.