To format a computer means that all your data will be lost. Your operating system, programs, emails, drivers, pictures, everything! All of the updates on your programs will be gone, infarct the every entire program will be gone.
This drop in TSH is an attempt to return circulating thyroid hormone levels to normal. So, a test to measure the amount of TSH in your system will usually show lower than normal TSH when the thyroid is overactive. So, in general, LOWER TSH = OVERACTIVE THYROID / HYPERTHYROIDISM.
With low thyroid most people will experience energy loss, weight gain, hair loss, dry skin, elevated cholesterol, constipation. These are all common symptoms of low levels of T3 or low levels of thyroid hormone overall. Now I hope you have a general understanding of the way these hormones work.