DOXYCYCLINE AND HAIR LOSS?

OK my derm gave me doxycycline for these little bumps i have been getting and i noticed my hair falls out like crazy in the shower.. i have read online that some other people have had the same thing but docs dont really listen when they say something. i plan to ask derm monday but does anyone else know of anything like this??????? my hair like is seriously falling out and its noticable