I too have Hashimoto's and was diagnosed 37 years ago. About 16 years ago an endocrinologist put me on thyroid medication Tirosint which is a nearly pure form of the hormone. Unfortuntly, it is expensive and there isn't a generic. My TSH values had been fluctuating up and down for years. Once I stated on the Tirosint everything leveled out and most of my symptoms like brain fog, fatigue, etc disappeared. The medication comes in a blister pack to prevent light and air from reaching the pills. If what you are taking now, is working great; however if you are not happy with it, consider trying Tirosint instead. (Side note: I am 85 and feel great.)