I was finally diagnosed 2.5 years ago - am 60. Started on 25mcg and my experience has been that i have a period of real wellness , then i start to get symptoms again.after a few months to a year . I then increase the dose at my request , feel really well , then it happens again. I am now about to go up to 125mcg but am not going to ask my GP as they prefer to take bloods before agreeing to change the dose and i know that they will probably come back normal . I will discuss it once i`m stable again at which point i will have bloods taken .. But i am anxious as to whether this kind of pattern is normal , and whether this will keep happening and i will need more and more .