After a TT or RAI, they usually say it takes up to a year to get the levels right.
Some level out quicker, some take longer.
But you should start to feel better around the 4 week mark.
Do as FTB4 says and get regular blood test.
Good Luck :)
You might want to post your levels, I have thyroid symptoms and being treated by an endocrinologist since early January, you get blood work every 6 weeks and they readjust your meds according to the lab results, it takes a while for your body to adjust to the medication (Hence the 6 week wait) Once you post your labs, members here will be able to explaine them to you, I am sort of new also, but the vets are pretty sharp. Good Luck FTB4