I have to tell you when I first complained to my MD that I was having somnolence, excessive exhaustion, apathy, etc. symptoms, the first thing that she did was test for an under-active thyroid. That if your thyroid is not producing enough hormone, it can cause depression-like symptoms. I'm not sure about over active thyroid though.

Might be good to ask around or just do some general research.

Take care,
Kimberly.