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is high which suggests that your thyroid gland is not producing enough hormone and condition is called Hypothyroidism
That is the reason your doctor has given Thyroxine
we need to test Thyroid function to adjust the dose of Thyroxine once dose is titrated tests may be done less frequently but medical supervision and follow up is must.
Thyroid derangement also causes Lipids
to rise so also keep an eye on Lipids.
When Thyroid levels are controlled than Lipids also come in normal range if needed treatment for Lipids can be given.
In most of the cases where hypothyroidism supplementation is long term may be lifelong.
In the meantime take care of diet and exercise.
Hope this Helps.
Dr.Akhilesh Dubey M.D.