"Hypothyroidism, medication, blood tests"

If I felt myself getting the symptoms of hypothyroidism with my medication at 140mcg, why would I then lower the dosage to 125mcg?

Is it because this fits with the dosage in which the tablets are supplied, which are 25mcg (the tablet measures around 6mm wide, please consider that when trying to cut tablets and weighting them on a jeweller's scale trying to get a lower dosage), 50mcg, 100mcg?

Did those suggesting such a drop in dosage consider the impact on my health and ability to cope, living with hypothyroidism symptoms including risks of accidents?

I refused to drop the dosage down to this lower dosage level.

I was diagnosed with hypothyroidism back in 2004, so I have been on medication for about 20 years. It is not easy getting the dosage at a satisfactory level that suits the safe parameters of blood tests and that doesn't leave patients such as myself feeling that they are getting symptoms of either being too low or getting too much medication.

I started getting the symptoms of hypothyroidism back in September 2024 again when I was on 140mcg, so I then slowly raised the dosage. I found 150mcg too low and 160mcg too high. It felt that around 156mcg was about the right level. It is very difficult to get accurate dosages using a jeweller's scale and a tablet cutter, however I had managed before to get it within the blood tests parameters using these.

Unfortunately, blood tests showed 156mcg to be too high. This was when I got a message from a member of staff at the practice and it was suggested that I drop down to 125mcg. I told them no, that I wouldn't drop it down to that level and also I didn't want to speak to the doctor, because it would result in an argument.

My fear about any discussion with the doctor resulting in an argument comes from pervious past experiences with other medical professionals.

Although I have been a Patient at this GP practice for over a decade, there have been quite a few staff changes, and I feel that a lot of the staff don't know me and I don't know them. I don't even know if they have a female GP currently working at that GP practice.

I want clear information and communication so that I can make informed decisions.