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I am sorry you are hypothyroid and when you have a blood test always get a print-out from the surgery and make sure the ranges are stated. Ranges are important as labs differ.
When you get a blood test for thyroid hormones it should be at the very earliest possible time, fasting (you can drink water) and allow a gap of 24 hours between your last dose and the test and take afterwards. This allows the TSH to be at its highest as it drops throughout the day and may mean the doctor wont reduce your hormones unnecessarily.
Levothyroxine should be taken with one full glass of water and wait about an hour before eating. Food can interfere with the uptake of hormones. Take levothyroxine with one full glass of water first thing as wait about an hour befor eating. Food interferes with the uptake of the hormones. Ask GP to test B12, Vit D, iron, ferritin and folate as we are usually deficient so everything has to be optimum.