Are you planning for pregnancy? If yes then you should continue thyrox tab as
TSH target for pregnancy is below 2.5 .
If not planning pregnancy then
thyroid is normal.
Are you obese & have PCOS problem ?
Metformin is insulin sensitized and also helps for weight loss in PCOS
What is your
insulin fasting,
HbA1c , FBS PPBS ?
More details of investigations required for further advice.