I head a loud popping sound in my right hand followed by a crack, my fingers have been numb and i can close my hand half way before it starts to hurt?

Go see family doctor: You didn't describe what you were doing when this happened but assuming that you injured yourself, you need an x-ray to look for broken bone(s). At the very least, get evaluated looking for nerve damage. Otoh, many people can "crack their knuckles" w/o any pain. But if it hurts & causes numbness, it's time to get evaluated. Good luck!