Ive been on this since 2009, I started on 25mcg and went up to 75 mcg supposedly its a normal level but I have stopped taking it because when im on it its giving me palpitations.... is this normal?? its getting in the way of my life so ive stopped it now and I am now suffering tiredness like u wouldnt believe like to the point I cant muster energy to tidy up for example.... I am freezing again also, I tried taking 50mcg instead but palpitations come back... The doctor says I need it so does that mean im going to have to put up with the side effects do any of you who are on this get side effects?? 