It is quite strange that synthetic thyroid
hormone is not available in your region.
This comes with different names and the most popular and easily available are ELTROXIN
you must make efforts to procure them from some other place.
Incidentally there is no substitute of thyroid hormone.
You must make sure,in consultation with your doctor,to start in proper dose and then subsequently adjust it by getting repeated TSH
estimation done at intervals of 6 weeks.