March 30th 2015 I Had The Left Side If My

March 30th 2015 I had the left side if my thyroid removed (right side was removed in 2011 so no longer have a thyroid) My last two blood draws my TSH was 0.02 . After surgery I was put on 137mcg.. then a month later lowered to 125mcg.. my levels havent changed so I was told to stop taking any levothyroxin for 3 days and then start on 100mcg. I have had shortness of breath and chest pains which prompted the new blood draw. I feel very weak in the esophogus area as though breathing is shallow yet my oxygen level stays between 92-99%... My question is this- is it okay that I was taken off for 3 days? And is the shallow breathing sense normal with hyperthyroid? Any help would be much appreciated