Dee,
From what I have learned the higher the TSH over the normal limits, means you are not getting enough of the Synthroid. Therefore if your TSH is now 6.8 it seems like you are not getting enough of the medication. To lower the dosage of the Synthroid,would have your TSH go up even higher. So, I think, your doctor may want to raise you dosage even though you are taking a large amount now. My TSH is creeping down into the sub normal ranges now and I may need to lower my dosage of Synthroid so my TSH goes back up into the normal ranges. I am getting to much of the meds so my TSH is being suppressed. Hope my foggy brain got this correct.
Regards,
Caren