TT in December 2009. RA131 (100mlq) January 2010 and again August 2012 (29mlq).My recent TSH was 0.013 and my T4 free was 1.80 so my doctor called and lowered my synthroid dosage from 150mcg to 137. I have been having a lot of palpitations as well. How long does this take to bring up my TSH level? I was wondering if I should just skip a day or two to move my numbers faster? I get blood work checked again in 8 weeks.