Hyperthyroid medication and Hormone replacement medication?

I DONT MEAN TO SCARE YOU BUT MY MOM HAD A CANCEROUS TUMOR BY HER THYROID AND HAD IT COMPLETELY REMOVED .. WELL IT TURNS OUT THAT THE WHOLE PROSSES OF GETTING THE RIGHT AMOUNT OF MEDICATION REALLY MESSED HER UP .. SHE DID GAIN WEIGHT BUT NOT ONLY THAT SHE WAS ALWAYS VERY TIRED .. I WOULD GLADLY SHARE MY STORY WITH YOU I HAVE A BIT OF THYROID BACKROUND DO TO THE FACT THAT MY TWIN SIS WAS ONLY BORN WITH HALF A THYROID AND IS ON MEDICATION AS WELL (FOR LIFE) AND ALSO I HAVE HAVE BEEN GOING WITH HER AND MY MOM TO THE ENDYCRONOLOGYS(I COULD NEVER SPELL IT CORRECT LOL) SINCE I WAS BORN... FEEL FREE TO EMAIL ME K BYE BYE (ms.dimples@live.com)