I have been on synthroid 150 mg/day after getting my thyroid removed for papillary thyroid cancer. I stopped taking it on January 31, 2011 and will be going through iodine radiation soon. However after being off the drug for the past 6 days I have stabbing pains in my back and pain in all my joints. My temperature has dropped, it is 97.1 and I don't feel like my body is regulating it's temperature. Is this normal?