Hi, this afternoon I slipped by a creek and fell on my back. I didn't feel any pain then, other than embarrassment. However, later on and through now, my lower back hurts and it feels like a lump just to the left of my spine. It doesn't hurt by itself, but if I rub it, or put pressure on it, it hurts a lot. So I'm wondering if you have any tips on what I might have done. I'm 25, if that helps. Thanks!