I had bypass 1992, had first thyroid surgery 2004. Only 1/2 was removed. In 2010 had other 1/2 removed, both times due to cancer. In 2011 I had gastric revision. I am finding now I am having trouble with leveling out tsh level. Did some research myself and found it could be due to not absorbing synthtoid correctly. Talking to doctor endor today about being put on gel capsule.