I've been having a lot of lower-back pain lately. I have an arch in my lower back when I sleep, so I tried changing my mattress to see if it would make things better. Unfortunately, it didn't help, and I continue to have discomfort. I attend a performing arts school during the day, and I'm on a dance team at night. I really want to get this back pain addressed so I can continue dancing. What do you think the issue could be?