Facing issues after changing Medicine.

Hi, I am living in Spain from past 1 year. I am using "Tyronorm " tablets from past 7 years. When I visited India in this January, I have checked my TSH in this January, according to doctor suggestion I have reduced my Thyronorm dose to 137 mg to 125 mg. Since then I was good. The tablets what I took from India are over, So, I visited the Doctor in Spain itself, and they checked my TSH it was normal 0.03, so thay gave me "Utirox 125mg". Due to my himoglobin level was low also as I have joint pains. They suggested me to take iorn tab and calcium tab for one month. After changing the Thyroid tab, I got too many issues, I can't be normal, my head is rotating, also I am having leg pains. I am observing few body changes too.. Is "Thyronorm" and "Utirox" both same or diff! Can I continue Utirox? Is there any issues if we change the brands... If so I will try to bring the thyronorm medicine from India. Thanks.