Hi please can someone help me . I was diagnosed with underactive thyroid two years ago . I started on 25 mg of levithyroxin actavis then discovered I was taking it incorrectly. Since this Christmas I have been ill with constant ear throat urinary infections shingles plus vertigo . I now have all the side effects listed in the tablets . I am extremely exhausted weak and dizzy . Is there a possibility I could be intolerant to levothyroxine or on too high a dosage ? I am only 37 lost my job due to the vertigo and not able to go to work . Please can someon offer any advice .