I congenital hypothyroidism. I am 38 yrs old. My T4 levels have been very unsettled for the last 10 years or so and had 3 monthly blood tests throughout. My GPs kept saying that my t4 levels are abnormal and kept altering my levothyroxine dosage. I am now taking 175mcg. I have never been offered t3 medication. Last year I finally won the argument with my GP to refer me to an endocrinologist. I had an appointment last year and the endocrinologist said I had to have the same brand of medication as strengths vary between brands. He also said that the GP's have been looking at the wrong result of the blood tests. They should be looking at the TSH not the t4. I am very confused as to what should be happening as I feel no better on the dosage and brand I'm on. The endocrinologist also tested me for low cortisol levels but it wasn't low enough for medication. I have another endo appointment next Tuesday (25th April). Any advice would be much appreciated.