I fell on while snowboarding a week ago and landed on a large rock, injuring my lower back, left side. A few days later a large bruise/hematoma appeared, but I didn't have much pain, just general tenderness. I don't have insurance so decided a Dr. visit wasn't necessary. Now, one week later, I am experiencing excruciating pain at the injury site. I've applied heat to it but it has brought very little relief. Is this something I should be concerned about? I did exert a lot of energy this weekend, but none of it was heavy lifting or anything particularly strenuous to my back.