I Fell Down 6 Concrete Stairs And Ended Upside Down

I fell down 6 concrete stairs and ended upside down and hurting my knee, left foot and back really bad. I have chronic lower back pain already and this definitely shot it up, I've taken 4 ibuprofen and 2 Tylenol and I'm still in a ton of pain... Theres bruises and swelling on all the places I mentioned, but am more worried about my back because the past few weeks I havent been able to be comfy in bed becaude of pain flare ups in my back :/ what should I do? We put ice on my knee and foot as well