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This is Dr. David. I am reviewing your question now and will be with you momentarily.
how old are you?
are you male or female
what have your free T4 levels been?
I am sorry you lost your peripheral vision. have you seen an eye doctor about this?
T4 Free should be 0.8 - 1.8 ng/dL (conventional units) 10 - 23 pmol/L (SI units)
T4 Total should be 4.5 - 12.5 µg/dL (conventional) 58 - 161 nmol/L (SI Units)
Free T4 is what is more important than T4
your TSH levels should be between 0.3 and 3.0
it is very common to have cysts in the thyroid gland and heterogeneous thyroid gland.
it is normal to see lymph nodes in your neck on CT scan.
you don't need to stress. I know you are worried
but you will be fine to see the endocrinology doctors at next available appointment.
this variation in free T4 is normal and not dangerous and not a sign of thyroid problems.
do yo have bad anxiety symptoms? severe anxiety symptoms can cause dizziness, nausea, brain fog, confusion.
free T4 of 0.46 is less than 0.8 ng/dL which is hypothyroid.
you will most likely benefit from going on thyroid supplement hormone of synthroid like 25mcg which can help bring up your levels.
you may benefit from blood test to check your estrogen levels checked
you should get your prolactin levels checked as well.
you should get a brain MRI scan to check your pituitary gland as well.