Thyroid problem is not curable, but is very treatable. Thyroid replacement therapy usually gets it lined out pretty quickly. Might take a little while to get the dosage right, but after that it is usually manageable.
These are very odd labs and I would like some clarification.
Mostly - is the lab (T3) above a Free T3 or an FT3?
Personally - I would lean its a total T3 with comparing the TSH reading is slightly in the hypo readings.
Yes - there are many things you can do and the word "curable" can be challenging - but you certainly can be well again managing this once you find the right fit in treatment.