Call the doctor and make sure that the medication is being taken correctly since iron supplements, soy, grapefruit, or drinks with caffeine can affect absorption.
You will need to see you doctor about this problem. Thyroid symptoms are difficult to diagnose and can display a wide variety of sequale (complications). It may be that there is a different medication or a combination of medications that would work better for you. Or lifestyle of diet changes.
You should go to the doctor and ask to have your thyroid levels checked. If they are off, then the doctor can adjust the amount of medication you are taking.