Have to agree with Rachel4, find another doctor.....
My TSH was 5.90, and my doctor told me she wants me to be 1.0. She was treating my symptoms....
Please get a second opinion. You need to be on medication.
5.9 is high! Especially if you are symptomatic.
The doctor that told you that people with 100 don't have symptoms is a bozo. Find a new doctor that will help you get to being you again!