Need help understanding diagnosis

[LJDelaney]

Recently saw my Dr. regarding symptom of dieting & inability to lose weight. She confirmed other symptoms such as tired, sluggish, losing concentration, extremely depressed and nervous when normally am energetic.  Given blood tests for thyroid with these results:

TSH    0.02
Free T4   0.90
T3 159

Was given diagnosis of hyperthyroidism, referred to endocrinologist and given ultrasound due to blood results.  I am not able to see him for at least 3 more weeks and am very worried because Dr.'s office called me today and said that I must not miss the appt w/endocrinologist and that my thryoid was underactive and covered in cysts.  I have been studying but am confused as to 2 different diagnoses and what the cysts might mean.  Also concerned because they took the time to call me to make sure I see the endo - I was actually too suprised when they called to even ask why they were so concerned.  Is there anything you can tell me to help me understand what might be going on?

[AR-10]

Yes, but the T3 and T4 are low, indicating hypothyroid.

There is more going on than has been found through tests.

[898]

By the definition, from Mythyroid.com, "Thyroid cysts represent enlarged fluid-filled regions of the thyroid that may be small (less than 1 cm) or quite large and sometimes arise very suddenly. A cyst, by definition, contains fluid. Thyroid nodules may be entirely cystic, in which case there are no solid components detectable within the fluid. Alternatively, the nodule may be complex, and contain both fluid and solid components"
The TSH is low, << then 0.3 which points to HYPER thyroidism.