Meaning not too serious. When i first started it was 4 tablets a day. 1 a day is pretty mild. Just follow up with doctor the next round and hope your condition stabilised.

Oh no, from 4 tablets then reduced to 2, and finally 1 when everything stabilized. All these were adviced by the doctor.

Doc asked me to go off meds since the 1.5 years had passed and my condition appears to be fine. Need to do monitoring/ check up 6 months later.

Few years and still on Carbimazole? Or is she taking a different medication?

Carbimazole is not meant to be taken long term because there will be side effects. That's why doctor asks to stop after 1.5 years.

https://en.wikipedia.org/wiki/Carbimazole#Adverse_effects
https://www.healthhub.sg/a-z/medications/102/carbimazole



Also check with your doctor on this. Need to take care of blood cell count as well if you're still on Carbimazole.

Lastly, her sleep condition may or may not be related to the medication she's taking or her condition. Did she consult the doctor of this issue? What's the cause of her inability to sleep? Is it due to the heart palpitation from her hyperthyroidism?

For better recovery, take care of her diet. Eat well, exercise well and try to sleep well. She has to manage her stress level and calm down whenever she's agitated.

Goodness, 17 tablets?! That's just...

Given her condition, didnt the doctor suggest surgery to remove her thyroid?

I'll recommend a psychologist first, before psychiatrist. Psychologists can't prescribe medicine (i think that's the last thing she needs unless the psychologist says otherwise), to help her manage her stress and worry. From there see whether there's any improvement.