I was just told that I may have an STD by my current boyfriend and he gave me azithromycin from the doctor who told him to give it to me, it was from a health clinic, but I was told by my doctor that my doxycycline I take for acne can also be used for the treatment of the same STD. Can I take both of them together? If I stop taking my doxycycline my acne gets very bad, but I don't know what to do.