Hi, Thyroid cancer
can be of different types. You should have mentioned the exact subtype. After thyroid surgery
there are possibility of radioiodine ablation . You should have mentioned the detailed treatment history. Anyway, thyroid hormone replacement
has to be done and this measure has been taken to you. But the exact dosing of thyroxin should be maintained based on the TSH level. Your symptoms may be due to this. Consult an endocrinologist
for proper dosing.