thyroid medication concerns

Hello, I am 32 years old and I have been on thyroxine for many years for the control of my hypothyroidism. However, at times I get very nervous and irritable or very fatigued and I believe it is my thyroid "kicking up" and I was thinking to change the dosage. What should I do? I would like to hear from someone with same thyroid medication concerns. Thanks.

Hi there, I have been taking thyroxine 0.15 mg per day for some years. I felt well most of this time, but recently I have had some rapid heart beating and sweating. I was also concerned about the dosage so, I talked to my doc about it and he has cut my dosage of thyroxine down to half. But it is not great still….Now I am feeling quite tired.