I saw your post and realized I had to respond and warn you! I took doxycycline for just 9 days and I know that it seriously messed with me. I've never had stomach problems before, and after taking doxycycline, my stomach and body in general got messed up. In fact, I took it right before I got EC, and wonder if that plays a role. It doesn't sound like a big deal, but chronic digestive problems are pretty awful. I took it freaking 6 months ago!!
I'm not trying to scare you or anything, just letting you know it has some pretty rough side effects on people. That being said, you do have a staph infection on your lips... damn. If I were you I'd take it, but if you feel any side effects at all I'd seriously stop taking it and consider an alternative, even a less harsh antibiotic. And take it with food! I took it on an empty stomach and that didn't help. Good luck! I hope that it helps and everything turns around for you.