Always ask for a print-out of your blood test results for your own records - we are entitled by law to have them and make sure ranges are included. You can then post here if you have a query or for a response.
We have to read and learn otherwise we might never get well enough. Of course, it would be better if we had knowledgeable doctors instead of us having to look on the internet for answers because I think we instinctively know their responses aren't right with regard to hypo.
Blood Test: Have the earliest possible appointment (TSH is highest a.m.) Leave 24 hours since last dose of levo and test as it may skew results and fast (you can drink water). Take levo after test.
Take thyroid hormones on wakening and wait approx 1 hour before eating. Some foods interfere with medication. Leave 4 hours between hormones and supplements which I have at lunchtime. Some prefer bedtime dosing, in that case you must leave 2 hours after eating before taking hormones. If you've had a fatty meal it should be longer. Food can interfere with the uptake.
Ask for Vitamin B12, Vit D, iron, ferritin and folate to be tested. They should be towards the upper range.