acne
"I've been on doxycycline for almost 4 weeks now, twice a day. My skin has really started to get better but recently I started getting nauseous after taking. The nausea usually subsides in 20 minutes, so I just used to deal with it. Avoid taking it before a car ride/playing a game/sport etc because that triggers nausea. It's a miracle drug and I hope ot works that way for you. 

P.S. Its true, it gets worse before it gets better"