I had surgery in january for partial thyroid removal due to severe graves disease. My follow up results show i need to start taking thyroxine. My TSH levels were 42.70 and free level of 6. not sure what these mean but my dr said i am now major underactive. i have noticed a few symptoms but so far i havent put any weight on. this is my main concern. i have also heard a few horror stories about how difficult it is to get used to thyroxine. I'm 26, living in england and had my surgery on the nhs. Any advice this is my worst nightmare so far as recovery until now has been really good.