First don't ever feel odd about asking your doctor questions. Any good clinician will be receptive and should not take these questions personally. No one knows you better than you so they need to know what you are thinking in terms of treatment too. It's treating the whole person not just their body.

Am I understanding that the blocking treatment means that your TSH is somehow ineffective at producing T3 and T4? Or something is possibly aberrant about the T3 and T4 making them ineffective?