I've been taking Synthroid for about 10 years and am currently taking 88 mg for hypothyroidism. I've started having hot flashes, very cranky, can't sleep, hair thinning. I just had my annual check-up and was told I am now hyperthyroid. The doctor has changed my dosage to 1 tablet daily, 6 days/week and on the 7th day take 1/2 tablet. I've been taking the new dose for about 7 weeks. The symptoms have not changed since changing the dosage. What are the chances I've developed a problem with the medication?