Looking for some reassurance please. I had my first Endo visit on the 14th of this month. On examination I've been told I have a goitre and am sub clinically 'euthryoid'. I have strong thyroid peroxidase antibodies titre >1,300 in keeping with Hashimoto's. I started leveothyroxine 50 mcg 10 days ago. Just wondering is it normal to feel slightly exhausted with difficulty concentrating? I didn't seem to have symptoms before medication although felt a bit tired. How do you all feel when you first started medication?