When you go to the endo, have them test for Hasimotos antibodies... Hasimotos is an autoimmune disorder that results in hypothyroidism... Read here... http://www.womenshealth.gov/publications/our-publications/fact-sheet/hashimot...
You may have to push for this test... Point is.. You can be showing sub-clinical hypothyroid blood work... But if the antibodies are in your blood, you can still have symptoms( this is what happened to me)... Research shows that treatment at this level for hashis w/ synthroid reduces symptoms and delays the destruction of your thyroid....
Hope this helps! Good luck!