I have a sluggish thyroid too. Been taking medicine for almost 24 years now. The doctors told me as a young woman that it was borderline low all the time-within the range as it were. I had all the classic symptoms, weight gain, hair loss, crappy nails etc., It was not until i was visiting my cousin in Baltimore and thought I was having a heart attack, that the doc finally sent me to an endocrynologist. LO and behold, she checked me and said it definately was hypothyroidism. and put me on synthroid. What a difference in my life. Got my energy back, lost the weight and feel good now. Oh and I had 4 miscarriages between my two children, which she also said was a result of the condition. So definately go get checked. It really is worth the time and the blood test.