Am I Sick Or Sad

So the past week has been a sad, depressing, shit week for me. I haven't exactly been feeling too well lately either. So my question now is, am I sad because I'm sick or sick because I'm sad? I mean I know that they're connected. When you're sad you commonly will feel sicker. In fact being depressed can make you lose an appetite just as much as gain one. I know I've been feeling sadder and less wanting to live the past week. It hasn't been totally fun. But damn does my stomach hurt. So does my head. Depression is a bitch.