Period Back Pain?

So, I've always had incredibly painful periods, I even remember collapsing on the stairs at my dad's house during one of my first periods. Lately they've been getting increasingly more and more painful, and this period is the first time I've ever experienced back pain along with it. I can barely move without feeling like somebody is kicking me in the back. Walking is horrible, and I have to slouch forward when I sit just to relieve the pain. I don't have insurance at the moment, and I know back pain is normal for a lot of people during their period, so I don't want to pay a huge doctor bill over nothing... Should I be worried, or just take some Advil and take it easy for the day?