I had radiation for Graves disease 2 years ago,

You have subclinical hypothyroidism.

Subclinical hypothyroidism can be caused by treatment of Graves' disease. Thyroid failure is common after radioactive iodine treatment. Increased TSH (above 5.0) usually indicates hypothyroidism, and decreased values indicate hyperthyroidism. Some patients have elevated TSH levels suggesting hypothyroidism but have normal thyroid hormone (either free thyroxine T4 or free T4).

An elevated TSH level (5.0 or greater) with a normal free T4 level is called "subclinical hypothyroidism". As your thyroid gland fails, your TSH level rises above normal when the free T4 level has fallen but is usually still within the limits of normal.

The goal is to maintain your TSH level within normal limits; your dosage of levothyroxine should be increased if the TSH level remains above normal (5.0 or greater) and should be decreased if the TSH level falls below normal (0.5). Once your correct dosage of thyroxine is established then you should continue to have your TSH measured every 6 to 12 months.

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I have had my levels tested several times and each time they said my levels are perfect at the 100 mcg dosage , but I feels as bad as I did when I first got the radiation. Was the decrease the cause of these symptoms, and if so how long will it be this way?Will a slight increase maybe to 125 mcg make the transition easier.I think I understand that you are saying that once my levels are right they are right and this might be something else causing these symptoms

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