Anyone have a clue?

For the past few weeks (about three) I've been tired all the time, moody as all get out, I've had random headaches and I have had right-sided pain near my lower lung and ribcage. Here's the thing, though: I've been losing my appetite, too. Yes, there's a lot of stressful situations going on, but the majority of the situations have calmed down quite a bit in the last few weeks and I know that these symptoms aren't because of Stress. What I would like to know is: aside from being pregnant (because I know that I am not), has anyone had these symptoms and what did you do to take care of them?