Ask your dr for a copy of your lab results so you will know your numbers. Then post them, lots of people are really knowledgeable and will help you
Just above your question, to the right, is a button marked "Health Pages". Click on it and you will find many topics with links that explain thyroid disease and thyroid function.
You are a "4"? I suppose that means your TSH is 4.0, which is a little high, indicating that one or more of your thyroid hormones is a little low. Normal TSH should be somewhere between 0.8 and 1.8, and 4.0 indicates mild hypothyroidism.