Hand Injuries Preventing Me From Tumbling

[TheCheerDiamond]

so i started a tumbling class to get my back handspring, and my hand is having serious pain in the middle of the top of my hand whenever i touch the ground in my bhs.there is a bone there, and im having terrible pain. i think i could have a small fracture possibly. i have a hand brace, but its not helping enough. does anyone know of a good brace? or is it possible that im not doing the bhs right?

thanks! :D
Emilie