TSH level of 3.610-should this be treated?

Hello,
I am a 31 year old, very active woman.  Four years ago, I went in for lab work for heart palpitations and my doctor ordered a TSH and free T4. Results came back as: TSH 5.3 (0.465-4.68) and free T4 1/12 (0.78-2.19).  Lab error was expected.  I was retested three months later: TSH 2.68 (0.34-4.82) and free T4 0.87 (0.77-1.61).  Over the last year, I have dropped 15 pounds with running and appropriate exercise.  Now I am fairly skinny.  I have since been experiencing EXTREME cold intolerance, possible peripheral neuropathy, dry skin (but I have been this way throughout my life).  I have always lost a lot of hair in the shower and when brushing it, yet I have a ton of hair on my head.  I have not had a period in a year and a half.  I had blood work run and TSH is 3.610 (0.450-4.500) and free T4 is 1.02 (0.82-1.77).  I have heard that endocrinologists have lowered there normal range, treating anything above 3.0.  Do you think that I should be treated for hypothyroidism?  I don't want to start taking levothyroxine only to find that the side effects are worse than what I am experiencing now.  I am just wondering if taking the medication will rid me of my extreme cold intolerance and possibly help with my possible peripheral neuropathy.  Please advise.  Your recommendation would be greatly appreciated!

[Mark Lupo, M.D.]

The cold and hair thinning may have been due to weight loss.
The thyroid levels are essentially normal, and in most cases we would monitor this over time.  Borderline hypothyroid would not likely cause peripheral neuropathy, but depending on severity of this issue, given your young age, would consider a neurology evaluation to determine cause.

[Gibbon1]

> I have not had a period in a year and a half.

I'm not sure why that doesn't get a doctors attention.

What other tests have you had done?