If my tsh level is 0.055 should my doctor not be concerned? especially if i can hardly function on a daily basis. i'm truly depressed, very very tired

Look elsewhere: Usually for a low thyroid problem to be the source of symptoms as you describe, the #s are in the double digits (15, 23. 45, etc.), so the lay press talking about "borderline" low thyroid should not see that dramatic of a problem (usually just tires easily / run down). If other bloodwork all ok, may benefit from talking to psych to see if actually could be depression--it happens to 40% of adults.

Hypothyroidism: The free T4 value is also important. If your low TSH is able to maintain free T4 levels to normal range then treatment not necessary. The symptoms that you described can be due to several reasons ie viral syndrome, acute or chronic fatigue syndrome, mononucleosis etc etc. The problem levothyroxine is that it can cause fatal cardiac arrhythmia as if given to a patient who does not need it.

It depends: A low TSH level most commonly means that the thyroid level is high, either because of too much thyroid medication or because your thyroid is becoming overactive. However, rarely it can mean that there is a problem with the pituitary gland. You need further testing of your actual thyroid levels.