While I'm in my periods, I start getting lower back pain. Sometimes it is so severe that I could not even move. Neproxin treats my period cramps but not the back pain. And also I have started getting this back pain daily now. I woke up daily having lower back up pain. When I sleep on bed, I feel it pains. When I tried sleeping on floor, it won't be there the next morning. Please suggest what might be the issue for that. And please also suggest any medicine for severe back pain periods. Thanks.