So sorry for your pain . . you might have it looked at. Turning blue could be a sign of a broken bone. At least immobilize it with two popsicle sticks and some fabric tape.
I did something similar. I was gonna take my big, strong and high thb. out to hand graze on the only grass available to him, outside of the stable but on the edge of a busy road. As I walked him down the aisle, the little voice in my head said, "you should get the stud chain.", "nah" , I answered. Then the little voice said, "You should go back to your locker and get your gloves.", "nah, it's too much bother", answered my lazy self.
So, as you can by now imagine, when we get ther, he gets very excited, goes racing around me at the end of the lead rope, rears up and then charges off, pulling me off my feet ,onto my belly for a split second bit of grass water skiing (on my tummy) and then my brain kicks in and I release the rope. He goes just as far as the greenest grass and then starts to graze. I was in such pain as the rope had torn off a huge chunk of my palm (like the size of half dollar coin), and had taken off almost all the layers of skin, down to the muscle. I couldnt grab the rope and I couldn't leave him. I just had to stand there calling for help until someon chanced to hear me and come and help. That hurt like hell!