I'm currently taking doxy(been taking it for a week now) I get terrible stomach pain, and feel nauseous. I don't have terrible "acne", but it bothers me. it's mainly my cheek area. I've been to the dermatologist a couple times, and have been prescribed different antibiotics. nothing really works. doxy has seem to be the only antibiotic that has done some work! I'm worried that when ever I finish my bottle the "acne" will come back! what should I do?