Recurrent Thyroid condition?

A year ago I went to the doctor with a list of symptoms that could have been copied from the definition of Hypothyroidism. These are symptoms I have had off and on for as long as I can remeber, often at times of great stress. I asked my doctor to be tested for hypothyroidism, he obviously hated me for trying to diagnose myself. He said I was likely just anemic. He tested both, surprise surprise, I wasn’t anemic, but my thyroid test was sufficiently abnormal to warrant a retest. By the time I had the retest, 30 days later, I was feeling better and my test was normal.

My question is: Is there a condition that causes hypothyroidism, or symptoms similar to hypothyroidism, that wax and wane as mine do?