I was recently diagnosed with Graves and began taking Carbimazole - 10mg a day. I am an opera singer and am away for 13 weeks so my GP thought it best to give me a relatively low dose to keep a lid on things until I can be monitored regularly. I was doing well - my raised pulse was settling and other symptoms were greatly eased. Then, as the pressures of opening night built, my heart began racing again and hasn't quite settled back down. Opening night was last night. Does anyone have similar experience of this and will it settle again?