I have a question. From experience, does 1 number really matter ? For instance, my TSH is 3.55. Most doctors like to keep that number around 2.5 or under. Is my number high enough to start Synthroid? Doctor gave me a prescription mainly because I complained of tiredness and exhaustion. I was just wondering if I would feel a difference if it just dropped 1 number. Hoping someone with same experience will see this and respond.