Pretty bad calf/shin pain

so I sent a handdrag 3 too big and I went to a shitty flat landing. I fell because I was way too far backseat, but when I fell I landed way back on one of my tails, which basically pushed my boot forward and caused an extreme amount of pressure to flex on my calf/ shin area. I kind of felt my shin bone flex forward pretty hard where the boot ends, so now I got some nasty shin splint type of pain along my shin. Fortunately I don't think it's broken because there's no swelling at all. But I am limping around. Anyone get this before? any idea how serious of an injury this could be? I've had shin bang but this really was more than that.