I know you are supposed to be completely honest with your doctor and all that.
But, in all those years I've been on thyroid hormone replacement (20 years), I have found that to be rather problematic.
I have never felt optimal on any dose of T4 that kept my TSH in range. Even before knowing as much as I do today, I used to raise my T4 dose on my own every time I felt slightly undermedicated. When I finally ended up on a dose that made me functional, my TSH had dropped to 0.05. That was in 2001. And it has been suppressed ever since (dropped to <0.01 on NDT).
Now, I know that is not a problem especially when on anything containing T3, but most doctors don't and freak out. Unfortunately, even though I tell them I see a specialist abroad they won't leave it at that, but start interfering, ordering labs, and then tell me I need to go back on levo only until my TSH normalises. Most never even test the FTs.
My current GP is driving me crazy. I see a connection between highish cortisol (following high dose steroid treatment), a rise in insulin and blood sugar levels, and a sudden rise in my triglyceride levels (from 75 to 150 in six months). But she keeps telling me she thinks it's related to my suppressed TSH and now wants to refer me to an endocrinologist, the treatment goal being to normalise my TSH. There is no way in h--- I am ever going back to a conventional endo...the one I was sent to back when I was originally diagnosed in 2000 said that "no patient ever needs more than 100 mcg of levo daily"...I doubt he was exceptional, but rather that most endos are like that. They don't treat our symptoms, they treat our TSH.
My GP also thinks my TSH could be responsible for my recently diagnosed hypertension (170/92, for which she put me on meds) and that is another reason she wants my TSH to normalise. She speaks as though an endo could just make that miraculously happen...but my TSH has been below 0 for almost 20 years, so may never normalise even if I took low doses of levo only for the rest of my life and had below range FTs...!
So, I will now have to find a new GP. But, the problem is, every time I tell a new doctor I am on thyroid hormone replacement, s/he will invariably request labs, then freak out because my TSH is low, and then start interfering...I just cannot stand that. I have spent so much time discussing this with useless doctors, spent so much money on useless tests (as my TSH will always come back out of range), and am just fed up with it.
So I have been thinking...maybe I should not mention my thyroid at all to a new doctor? How big a risk/chance is that that s/he will request thyroid labs if I don't mention I'm on thyroid hormone replacement? Of course, if I don't mention it, and the doctor then orders labs anyway, I'd look stupid...and keeping something like that from a doctor would look suspicious. But I just don't want another doctor interfering and messing with my treatment...!
I realise this may sound ridiculous, but this is turning into a real problem for me. I am simply so tired of having to explain to ignorant doctors that I cannot take a dose of levo that keeps my TSH in range and be fully functional at the same time...something they cannot understand. If on levo only, I need my FT4 levels high in range (at the very top or slightly above) to have enough T3, and that will cause my TSH to drop below range. The last time I had a normal TSH back in 2001 (on 150 mcg of levo), my FT3 levels came back at the bottom of range and my FT4 levels were only midrange. My TSH simply does not tell me anything about my thyroid status, and has never correlated with my wellbeing, whereas most doctors think it's the only thing that matters.
How do those of you on T3/NDT (or with a low TSH on levo only) deal with ignorant doctors who want to interfere and force you to go back on levo or lower your levo dose?