Brief Answer:
Thyroid

Detailed Answer:
Sorry to learn about your challenges with thyroid dosing.

It is usually not difficult to regulate thyroxine doses, especially for endocrinologists who are specially trained in thyroid management.

Once stable target levels of TSH and Free T4 are achieved, the thyroxine dose can be monitored infrequently, for example only annually.

When I see someone like you in my practice, I first determine if they can be presumed cured of the cancer. In order to go about this, firstly one needs to know what type of thyroid cancer you had. Then there is a systematic way to begin the assessment and a thorough physical examination is the first step. For example, in case of 'differentiated thyroid cancer', I typically order blood tests for serum quantitative thyroglobulin levels along with serum anti- thyroglobulin test.
If it is evident that the cancer is cured, then the goals for TSH and free T4 are set as for any other individual without a thyroid gland. I use 0.5 to 2 as a target range for TSH. I aim to keep Free T4 as close to the higher end of the normal range as possible.

With these objective in mind, I easily manage to keep my patients' thyroid doses stable in the long run.

Now every so often I do encounter individuals whose thyroid is not easy to stabilize. In these instances, I look for potential reasons:

1 Is thyroxine being taken correctly? Or is it being taken with food/other medications particularly iron and calcium?

2 Is it possible that the patient has celiac disease which can lower the absorption of thyroxine?

I see you are gaining weight but the key point is that if your thyroid blood tests are fine then other reasons for weight gain need to be explored.
There are certain rare conditions like acromegaly and Cushings disease which cause weight gain. You may wish to ask your endocrinologist if (s)he thinks you need to be tested for these.

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Brief Answer:
Follow up

Detailed Answer:
Well, it is about time you did

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Brief Answer:
Second follow up

Detailed Answer:
I see.

Well in this case first ask your doctor if you are presumed cured of the cancer. This requires certain tests as explained above.

Once that issue is settled then aim for the TSH goals mentioned above for individuals without a thyroid gland.

It should not be particularly difficult to arrive at the right dose of thyroid medication for you. It is a matter of doing it with finesse and expertise. An endocrinologist is well trained to do this

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