Difficult to determine if dosage is too low without more info. What med and dosage are you taking? What is the reference range for the T4, as shown on the lab report? If tested for Vitamin D, B12 and ferritin, please post those results also.
Not sure but I am tired and ache more then normal thought that was just getting old. So does that me it is to low?
Meant to also ask what symptoms you have.
Are you taking any thyroid med?