Dolphin, My labs were ordered and my TSH was within normal limits. My Psychiatrist ordered a "Free T4" and it came back "very low." From what I've read, this is an important indicator yet my Primary Care Doc only ordered the TSH. Now that I have a low T4 (and I got Vertigo on Synthroid), my PCP is ordering a "Full Thyroid Panel." Perhaps you could start by specifically asking for a "Free T4" test. Additionally, the internet world debates the "normal ranges" like crazy. From what I've read it's often misdiagnosed or missed. Since you mentioned the change after your 5th child, ask for your "female hormones" to be tested too!