I have been on thyroxine for nearly a year now and things were stable. my last blood tests meant having my thyroxine reduced from 100mg to 75mg. however i am still experiencing all the symptoms of being overactive. Anxiety, heat intolorant, hunger, breathless. would you say there is still a build up of the thyroxine in my system, or is it possible my thyroid has started to produce too much thyroxine again? Any thoughts?