I'm sure they told you this but, on doxycycline, you need to keep out of the sun! When I was on it I got beet red in 2 hours of being outside in the summer (with spf 35 on the whole time). If there's any advice I can give....that's it lol. Also, try eating a full meal with it. Upset stomach is a pretty common side effect of doxycycline. And you really shouldn't take it if you're pregnant or wanting to become pregnant soon. They actually made me take a pregnancy test before they would prescribe it to me.