i have an over-active thyroid and at my peak, my body was working overtime. i was releasing hormones at 4 times the rate of the average person and have never been so hyper in my life. you're hungry all the time, can't stop moving and can't sleep - my family didn't quite know what to do with me.
i had three options - doing this block and replace thing (i've now been taking 4 tablets a day for the past 3 years), having my thyroid taken out (thus being on thyroxine for the rest of my life), or getting radio-active treatment, which sounded like a good idea untill i found out (the consultant failed to mention) that once you have had it, you can't be in extended close proximity of anyone for the next 6 months - so i could only pass people, not stay and chat. bugger that being at uni.
if you do have an underactive thyroid then you're probably luckier. theres only really one option of treatment available to you, and thats being on thyroxine for the rest of your life. you wont have to pay for this, and taking one tablet every day is nothing. You'll also soon get more energy and will be back to your normal self, and wont really be bothered about taking the tablets. x