Dose of thyroxine depends on body weight . For subclinical or mild hypothyroidism (
TSH high and T4, T3 normal ) dose is 1 mcg of thyroxine per Kg and in overt hypothyroidism or severe ( TSH high , T4 low ) dose is 1.6 to 1.8 mcg per kg .
Next Steps
You will need to increase the dose of thyroxine .
Also you will need to change the BP medications your BP is not under control .