Complications

Another week down...somehow.

I went and had my physical today and while my weight is down (take that Zyprexa!), it turns out my thyroid is low too. They're not sure if it's an isolated incident or if it's long term, so they'll test me again. I looked up the symptoms of a low thyroid and while I have some of the symptoms, one of the listed symptoms was 'depression'. Now, some of the other symptoms include fatigue, weight gain, and memory loss. That sounds like overlapping symptoms with depression. Thus, how do doctors diagnose and treat simultaneous medical issues in a person when some of the symptoms are the same?