Hi angela100 from my own personal experience I had breathlessness when I was taking too much NDT..I presume it's the T3? As when I reduced the NDT the breathlessness went.. it was quite scary.
It may take another day to dissipate but if not perhaps something else is causing the breathlessness? Your Endo should do a blood test if he hasn't already to see your levels?
Of course, I am not medically trained just letting you know my experience.
I hope things improve for you very soon, you will get good advice on here am sure.
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