Last November I had half my thyroid removed as I had a goitre, consultant said I didn't need medication when I saw him in December. This week I have a cold(2nd this year) and the symptoms of underactive thyroid have returned plus my throat is painful and voice gone. Is there anything I can do or get to help. Will this keep happening? I was just beginning to get back to normal and work after the op now I feel back to soon after the op.