Carbimazole Dose Change - looking for similar experiences

Hi all,

Latest blood results on 15mg Carbimazole for 5 weeks showed the following results. I have been taking 10mg for the last 2.5 weeks and now the endocrinologist has advised the GP to tell me to stop taking Carbimazole for 3 days and restart on 5mg (no additional blood test since the one that gave these results). 

Does anyone have experience with this? Based on the trial and error with Carbimazole so far, I feel like titrating more gradually would be better. Last time my dose reduced quickly, I started to feel hyper symptoms returning quickly too. 

Serum free T4 level: 5.8 pmol/L [7.8 - 18] 

Serum free triiodothyronine level: 4.98 pmol/L [3.5 - 6.8]

Serum TSH level: 7.22 miu/L [0.2 - 4.3] - Above high reference limit