Dear thyroid sufferers, After 15 months on carbimazole Endo signed me off about three weeks ago. Unfortunately, having a stressful time my Thyroid went haywire. Blood results from medicheck are >100.000 (, they can only go up to this,) Range 12. - 22 . My doctor has prescribed 20mg carbimazole per day. My question is - should I be on 40 mg per day. I feel awful and would like to get something like for Christmas. Please advise if you can. V.