Welcome to HCM,
You are suffering from hypothyroidism
, supplementation of 100 microgms levothyroxinne is naturally right treatment it should be monitored with intermittent TSH measurement.
Your nausea may be drug induced, withhold drugs for few days and see you feel better ,simultaneously see your Physician to examine if there is any signs of gastritis,or Hepatitis
If required S.Bilirubin
,SGPT,may be done..
You continue to take Levothyroxine
Once your Nausea and vomiting controlled other drug may be introduced one by one in consultation with your Gynecologist.
Hope this information helps you