Really sore coxex bone

So last night me and my man did anal for the second time, but he took ages trying to find my actual entrance as he kept smaking my coxex bone. At one point he tried going in too fast and hurt us both as he smashed into my bone again, making me flinch in pain and making his knob click. I woke up this morning (after we actually had anal) and my bone is in immense pain,like I can't stretch without it hurting. Is there anything you suggest to help with the pain, its unbearable.