some people stay on carbimzole for years and years, for instance some people take 2.5mg once a week. I had a TT for Graves and I have gained 53lbs that I cannot lose despite now brilliant blood results. I could give you a very long list of other disasters this operation has caused me. My endo said it's due to poor peripheral metabolism which is related to autoimmunity and former hyperthyroidism in ways in which they don't yet understand. Nearly three years post op I still don't work, I've had to move back in with my parents, I was diagnosed aged 37, I'm now nearly 42 and have missed my chance to have kids (the op wrecked my sex hormones too). It's been a NIGHTMARE. I'm doing OK now but only because I had to figure it all out and treat myself - the tests and drugs and supplements and treatments involved have cost me thousands of pounds. The NHS has washed its hands of me. I know hundreds of people like me too - quarter of all people who lose their thyroid never recover their health and they don't know why (I know why, but welcome to the INSANE world of thyroid treatment!!!).
Don't do RAI, I agree iodine uptake is in the breast, ovaries, gut - not just thyroid - I know lots of RAI casualties. By a cat's whisker, TT is better than RAI (this is bit like choosing between being hung or drowned, if you get my drift!).
If the drugs are working for you, and you are doing OK then in the nicest possible way I'd give yourself a kick up the bum to be compliant in taking them Put a bleep on your phone. I would have given my right arm to be have been able to do that.
For the love of God, do not lose your thyroid unless you really, really have to, life will NEVER be the same without it.