Can you have adrenal fatigue without having thyroid issues?

I've experienced extreme fatigue during the day for the past couple of years. Finally got my blood work taken and the Dr. tested my thyroid, which came back completely normal he said. I've been researching online, and really feel like I relate to the majority of the symptoms of adrenal fatigue. Is there a way I could still have it, even without any thyroid issues? Also got tested for my B12 levels, iron, and diabetes. Everything was fine.