I was diagnosed hypothyroid approx 15 months ago. Prescribed levothyroxine 25mg, then 50 mg and now, for the past 5 months 75mg. I had been suffering severe muscle pain but this has now eased, presumably due to the meds level being correct. However, for the first time in my life, I’m experiencing significant insomnia. I requested a thyroid blood test to see if the cause lay there but my gp is resisting testing my blood again as the last reading was, for the first time, perfect. I am struggling to understand: isn’t it worth checking the stability of my levels or once they’re corrected my medication, is it safe to assume they stay stable?