Welcome to our forum,
The first thing to do is to get a print-out of your blood test results, with the ranges (these are in brackets after the result) and post on a new question if you don't have them at present.
I was undiagnosed for quite a number of years and I'd never heard or knew anyone who had a problem with their thyroid gland. I don't think any of the doctors/consultants I saw knew about it either as none did a blood test but gave me different diagnosis for my symptoms.
So, it is a learning curve for us if we have a problem/or suspect a problem.
Before the blood tests were introduced, we were all diagnosed upon our clinical symptoms only. Nowadays, being modern, doctors have lost this knack of diagnosing and it all rests upon a blood test and many don't know how to interpret them properly and also time of day changes the TSH itself, i.e. highest early a.m. and drops throughout the day.
You can have a full thyroid function test from one of our recommended labs and one in particular have special discount on Thursdays, and they are also home tests which is relatively easy but you have to be well hydrated and a few days before drink plenty of water.
Tests should be TSH, T4, T3 Free T4, Free T3 and thyroid antibodies.
Doctor should test B12, Vit D, iron, ferritin and folate.
Tests should be at the earliest possible, fasting (you can drink water), and if you were taking thyroid hormones you'd allow a gap of approx 24 hours between last dose and test and take them afterwards.
There is a link below re hypo and on the main site, Thyroiduk.org.uk there is also details of hyperthyroidism plus other information.
Always get a print-out of your results with the ranges for your own records. If you have a query you can post for members to comment.