Coincidence?

I woke up with a headache this morning. Well, in truth, I first woke up at 4am and spent about 2 hours awake catching up on blogs, then I went back for a nap and woke up at 9am with a headache. So, what is the coincidence? I have to go to work today after 2 nights of great sleep and 2 glorious days off. It's weird because I don't hate my job. Besides the stress that goes with it, I actually like my job. I think it's important work, I feel reasonably competent at it, and many of the people I work with are great (there are always pains-in-the-*** anywhere you go, but you know what I mean). All last week I was feeling kind of headachey too but this weekend I felt great.

So, there are a few options:
1. Hubby is starting to come down with something and he passed it on to me (he has been headachey the last couple days).
2. I have "selective" allergies that flare up only when I'm not completely relaxed.
3. I am surpressing my feelings again and unaware of how I really feel about work.
4. I really want to stay home with the baby (and can't right away for financial reasons) and am internalizing stress symptoms before the baby is even viable.

I don't know if there are any more options, but those are the ones I can think of off the top of my achey head...