It looks like you have relapsed into hyperthyroidism. Did the TSH go high 3 months post 8/05 RAI or was the hypo based on T4/T3 levels dropping? You may have had a transient "knock-down" of
the hyper with the I-131 and the graves disease
(I assume it was graves
) was strong enough to come back and over-stimulate any surviving thyroid tissue. Has the goiter come back? Do you have eye symptoms?
The T4/T3 are high enough that it is not simply too much levoxyl most likely.