My levels go up and down. I have had 4 different strengths of meds in the last year. The dose I am on now is 150mcg a day. I have taken strengths as high as 250 and as low as 75. My doctor is not very forthcoming with information. I see my doctor again in October. Do you have any suggestion of questions I should ask her?
Because hypo and hyper share some of the same symptoms.
How did your meds. stop working for you?
Has your thyroid completely stop functioning to where your taking med. dose of 300?
In Hashi, sometimes when the thyroid is not totally dead, the functioning part might produce extra amount of thyroid hormones resulting in a temporary hyperthyroid state. This phase can last 3-6 months until the thyroid gland fully recovers. Then you will go back to hypo state. It seems that Hashi can, in some, wax and wane between hypo and hyper phases until it is totally nonfunctioning, while others may never have further trouble.
That's my best explanation - what has the doctor said recently, for the reason.