BAM and thyroid - is there a connection?

[g0courtney]

I've had an overactive thyroid since 2016 and have been on various doses of Carbimazole. Since August 2018 I've been on 2.5mg daily and in December had blood tests showing I was totally stable. Since March I have been treated for Bile Acid Malabsorbtion (completely ridding me of the diarrhoea symptoms I was still having, despite my Endo repeatedly telling me it was irrelevant!).

However, I had a follow up appointment yesterday and am actually now underactive, even though I am on a very low dose of Carbimazole. I have been advised to come off meds until a blood test in 3 weeks. Does anyone have any idea how I have become underactive on such a low dose? Only in the last few weeks have I felt tired (which now makes sense) but I've otherwise felt the best I ever have