Hello, I Am Concerned I Have Injured Myself. But Not

Hello, i am concerned I have injured myself. But not sure what it is. I was having a bit of back pain yesterday. But when i woke up today it was bad. And has got worse over the day. And there is bruising now. The pain is worse on the left from the spine to rips to my side and slightly under the side of the chest. It hurts in the lower back and now shouldes. But when i stand my legs get weak and crampy as well do my arms when i use then. Its getting pretty horrible. What do it do.