Has anyone had major increase in TSH count one and a half years post op?

I checked the library and couldn't find a situation that fit mine so I'm writing for help. I had LAP RNY about a year & a half ago. I've been on levothroid for about six years and my TSH count has been in the normal range and I've taken the same dosage of meds all this time. I went for routine bloodwork and this time my count was up to 16 instead of the normal range. The doctor upped my dosage and I go back in several weeks to check it again. I've been really tired and have been losing a lot of hair so I knew something wasn't right. Has anybody experienced this a year & a half post op? I've lost 117 pounds and other than that, I feel good.

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